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Travelmath provides an online cost calculator to help you determine the cost of driving between cities. You can use this data to figure out a budget for a road trip. The driving calculation is based on the average fuel efficiency of your vehicle, and you can change the gas mileage in mpg or L/100 km to match your exact make and model. Gas prices are automatically estimated based on current fluctuations, and again you can adjust these to fit your local gas station prices. Both U.S. and international units are available to make the calculations easier to use, and the output is given for both one-way and round trip travel routes.

Check the driving distance for your planned route, and see if the total driving time requires an overnight stay. If it's a long trip, you may want to research some hotels along the way . Or compare whether it's better to fly or drive to your destination.

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Road trip gas calculator

Don't Just Estimate—Calculate and Optimize with Roadtrip

Welcome to the simple web version of Roadtrip's Fuel Calculator. More than just a calculator, this is your comprehensive guide to fuel cost planning, whether you're prepping for a quick commute or a grand road trip adventure.

Why Every Driver Needs Roadtrip's Gas and Fuel Calculator

• Pinpoint Accuracy : Tailor your calculations based on your car's actual mileage for the most accurate estimates.
• Speedy Results : In a few clicks, you can know exactly how much you'll spend on fuel.
• Any Device, Any Time : Our web-based Gas and Fuel Calculator is free and universally accessible.
• Updated in Real Time : Never get caught off guard by fluctuating fuel prices again.

The Roadtrip App: A World of Features Just a Click Away Download Here

Sure, our Gas and Fuel Calculator is handy, but why settle for basic when you can have it all with the Roadtrip app? Here's what you'll get:

• 🌎 Smart Route Planning : The app's geo-location features do the hard work for you, finding the most fuel-efficient path.
• 🔎 Just search for your car : We look up the specs of your car so you don't have to, ensuring our fuel calculator is as accurate as possible.
• ⚡️ Electricity Costs, Too : Own a hybrid or electric vehicle? The app adapts to include local electricity costs in your estimates. Try the EV calculator.
• 🌱 Carbon Emission Estimates : The app shows you the estimated carbon emissions for your trip based on how many gallons of gas or litres of petrol you use on your trip.

Bottom Line : If you find the Gas and Fuel Calculator useful, you'll find the Roadtrip app indispensable. Download it now and transform the way you plan your journeys.

How to Maximize Savings with Roadtrip's Gas and Fuel Calculator

• Input Distance : Start by entering the distance of your journey.
• Update Fuel Price : Use the most current local fuel prices for precise estimates.
• Include Your Car's Mileage : Customization is key—enter your car's mileage for an estimate that's uniquely yours.
• Calculate : Hit the button, and you'll get an instant, accurate estimate that helps you budget smarter for your trip.

Frequently Asked Questions

Q: Is the Gas and Fuel Calculator really accurate? A: Our Gas and Fuel Calculator is incredibly precise when given the right inputs. However, for a deeper dive into your trip costs, including live fuel prices, you'll want to download the Roadtrip app .

Q: How much does it cost to use the Gas and Fuel Calculator? A: It's entirely free. But for a full suite of planning tools and real-time updates, the Roadtrip app is your go-to resource .

Q: What extra features do I get with the Roadtrip app? A: Everything from real-time fuel price updates to route optimization is at your fingertips. Experience the difference today .

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Cost To Drive

The cost to drive app helps you calculate the cost of driving between cities, taking into account how much gas you'll need, current gas prices, mileage driven, fuel efficiency of your car or truck in MPG, and other variables. Calculate your driving cost and plan a road trip using this tool.

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Calculating the Cost of Gas

How to Estimate Cost of Gas for a Road Trip

Many people assume a road trip is a cheaper way to travel across the United States than flying, but that isn't always the case. It depends on the current gas prices and your car's mileage, so you should always calculate the cost of your potential road trip before you forego that plane ticket. To do this, you'll need to know the current price of gasoline, the miles per gallon your vehicle gets on the highway, and the miles you intend to drive on your trip. It's pretty simple, and you can get the bottom line in four easy steps.

Calculate Your Gas Mileage

You first need to look up or calculate the mileage, or miles per gallon (mpg), your vehicle gets. You can do this yourself with simple math, or you can use an online mileage calculator . However, your actual mpg may vary depending on your particular driving style, for example, if you prefer to use cruise control or not. You can also try to figure it out by writing down the reading on your odometer the next time you fill up your car. If you have a computerized console, you could also set your trip odometer to zero by pushing the little knob underneath the odometer.

After setting the trip odometer or writing down the number, drive normally until it's time to fill up again, and note the odometer reading or the miles on the trip odometer when you fill it up again. Subtract the first odometer reading from the second to give you the number of miles you've driven. Or, if you set the trip odometer to zero when you filled up the last time, that figure is the number of miles you have driven on that tank of gas. Divide that number of miles by the number of gallons you just purchased on your second gas station visit, which will give you your miles per gallon.

Remember that your mileage will vary based on whether you spend more time driving on the highway or in town. City driving means you'll spend a lot of time stopping and starting, which uses more gas, so your mileage will be lower. If you use a whole gallon of gas to drive just on the highway, however, your calculation will be more accurate

Research Your Trip Distance

Next, calculate the total distance you'll be driving on your road trip. For this, you can use AAA or Google Maps. Enter in your starting and finishing points, along with any stops along the way, and then note the number of miles it says your trip will cover. Make sure you check that the route it's plotting out is likely to be the one you'll take.

If you're planning a several day-, week-, or month-long road trip, you might make some side trips or detours, so it would be impossible to calculate the exact distance. However, you can still make an educated guess by adding in some side trips to your total, so if you decide to skip out on them, you'll be spending less money than you budgeted for. Jot down the total distance you'll be driving, plus extra for potential side trips, next to your figure for miles per gallon.

Find Out the Current Price of Gas

For the third step, you need to know the current gas price to keep your total figure as accurate as possible. It's not possible to know the exact cost of a gallon of gas at any given time in any given location, but knowing the current price will provide you with a dependable approximation of the total fuel cost for your trip. Use AAA to find the average national gas price . Jot down the amount given at the top of the page as your third figure.

Add up Your Trip Cost

Take the mileage of the total distance of your trip and divide it by your miles per gallon to get the number of gallons of gas you will need on your journey. Then multiply that figure by the current gas price, and the result is the estimated cost of gas for your road trip.

For example, say you drove 200 miles after filling your car up, set your trip odometer to zero, and had to return to fill up again. On your return to the gas station, you topped up your tank with 10 gallons of gas. Your mpg would then be 200 divided by 10, which is 20 mpg. You are planning on driving 850 miles on your road trip, and the average price of gas was $2.34 at the time you checked.

To calculate the amount of money you need to budget for your road trip, divide 850 by 20 to get the number of gallons of gas you will need, which is 42.5. Multiply 42.5 by $2.34, which gives you $99.45 as the total cost of gas for your road trip. 

Don't Forget Other Travel Costs

The cost of gas is only one aspect of the expense of a road trip. You'll also need to factor in lodging, meals, maps , road tolls, and other car-related costs. If you're traveling with friends, you can divvy up the cost of gas, so your transportation fee will be even less per person.

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• Travel Tips

How To Figure Out Gas Mileage For A Trip

Published: December 4, 2023

Modified: December 28, 2023

by Jessi Vogel

• Car Rentals

Introduction

Planning a trip involves a lot of details, from choosing the destination to booking accommodations. One essential aspect that often goes overlooked is calculating gas mileage for the journey. Understanding your vehicle’s gas mileage not only helps you estimate fuel costs, but it also enables you to plan refueling stops along the way. Whether you’re embarking on a cross-country road trip or just driving a few hours away, knowing how to figure out gas mileage for a trip is a valuable skill.

In this article, we’ll guide you through the process of calculating gas mileage and provide tips for improving it. We’ll also discuss the factors that affect gas mileage and how to gather the necessary information. By the end of this article, you’ll have the knowledge and tools to estimate your fuel consumption accurately and make informed decisions about refueling during your journey.

So, let’s dive in and learn how to figure out gas mileage for your trip!

Understanding Gas Mileage

Gas mileage, also known as fuel efficiency or fuel economy, refers to how far a vehicle can travel on a certain amount of fuel. It is typically measured in miles per gallon (MPG) in the United States. Understanding your vehicle’s gas mileage is crucial for estimating fuel costs and planning your trip effectively.

The concept of gas mileage is straightforward: the higher the MPG, the more efficiently your vehicle uses fuel, which means fewer refueling stops and lower fuel expenses. For example, a car that gets 30 MPG can travel 30 miles on one gallon of gas.

It’s important to note that gas mileage can vary depending on various factors, including driving conditions, vehicle type, and maintenance. Additionally, gas mileage tends to be different between city driving and highway driving due to the differences in traffic congestion and driving speeds. City driving usually involves more frequent stops and starts, which can decrease gas mileage.

To improve your understanding of your vehicle’s gas mileage, you can refer to your owner’s manual or check the manufacturer’s specifications online. This will give you a baseline estimate of your car’s average MPG. Keep in mind that this is just an estimate, as your individual driving habits and conditions can affect the actual gas mileage you achieve.

Having a good understanding of your vehicle’s gas mileage is the first step in planning your trip and budgeting for fuel expenses. In the next section, we’ll explore the information you need to gather to calculate gas mileage accurately.

Gathering Information

Before you can calculate your gas mileage for a trip, you need to gather some essential information about your vehicle and the upcoming journey. Here are the key details you should collect:

• Odometer Reading: Start by recording the current mileage on your vehicle’s odometer. This will serve as the starting point for your trip.
• Fuel Tank Capacity: Determine the total capacity of your vehicle’s fuel tank. This information can usually be found in your owner’s manual or by checking the manufacturer’s specifications online.
• Fuel Price: Research the current price of fuel in the areas you will be traveling through. This will help you estimate your fuel expenses for the trip.
• Trip Distance: Calculate the total distance you will be traveling on your trip. Use online mapping tools or GPS navigation systems to get accurate distance measurements.

Once you have gathered this information, you will have everything you need to calculate your gas mileage for the trip. The next section will guide you through the process of making this calculation.

Calculating Gas Mileage

Calculating your gas mileage for a trip is a simple process that involves dividing the total distance traveled by the amount of fuel consumed. Follow these steps to calculate your gas mileage:

• Fill up your fuel tank: Start by completely filling up your vehicle’s fuel tank before the trip. Make sure to note the exact amount of fuel added.
• Record the starting odometer reading: Note down the mileage on your vehicle’s odometer after refueling. This will be your starting point.
• Drive the desired distance: Go on your trip and drive the planned distance, making sure to maintain a regular driving pattern.
• Fill up your fuel tank again: Once you have reached your destination or completed the planned distance, refill your vehicle’s fuel tank and note down the amount of fuel added.
• Record the ending odometer reading: Take note of the mileage displayed on your vehicle’s odometer at the end of the trip.

Now that you have all the necessary information, you can calculate your gas mileage. Use the following formula:

Gas Mileage = (Ending Odometer Reading – Starting Odometer Reading) / Fuel Consumed

Divide the difference in odometer readings (ending – starting) by the amount of fuel consumed (fuel added at the end – fuel added at the start). This will give you your gas mileage for the specific trip.

Remember that gas mileage can vary, so it’s a good idea to repeat this process a few times for more accurate results. You can then average the calculated gas mileages to get a better estimate of your vehicle’s overall fuel efficiency.

Now that you know how to calculate gas mileage for your trip, let’s explore the factors that can affect your vehicle’s fuel efficiency.

Factors That Affect Gas Mileage

Gas mileage can vary depending on several factors, so it’s important to be aware of these variables that can affect your vehicle’s fuel efficiency. Understanding these factors will not only help you calculate gas mileage accurately but also enable you to make adjustments to improve it. Here are some key factors that can impact gas mileage:

• Driving Habits: Aggressive driving behaviors, such as excessive speeding, rapid acceleration, and hard braking, can significantly decrease gas mileage. Maintaining a steady speed and avoiding sudden movements can improve fuel efficiency.
• Vehicle Maintenance: Regular maintenance, such as oil changes, air filter replacements, and tire rotations, is crucial for optimal fuel efficiency. Neglected maintenance can lead to reduced gas mileage.
• Driving Conditions: Gas mileage can be affected by factors such as traffic congestion, hilly terrains, and extreme weather conditions. Stop-and-go traffic and driving on rough surfaces can decrease fuel efficiency.
• Vehicle Weight: Carrying excessive weight in your vehicle, such as heavy cargo or unnecessary items, can increase fuel consumption. Remove any unnecessary items to lighten the load and improve gas mileage.
• Tire Pressure: Keeping your tires properly inflated is essential for fuel efficiency. Underinflated tires create more rolling resistance, resulting in decreased gas mileage.
• Vehicle Type and Size: The make, model, and size of your vehicle can influence gas mileage. Smaller, lightweight vehicles tend to have better fuel efficiency than larger, heavier ones.

By understanding these factors, you can take steps to improve your vehicle’s gas mileage. In the next section, we’ll share some useful tips to help you maximize fuel efficiency during your trip.

Tips for Improving Gas Mileage

To make the most of your fuel and maximize gas mileage during your trip, consider implementing these tips:

• Drive at a steady pace: Avoid rapid acceleration and sudden braking. Maintaining a consistent speed can improve fuel efficiency.
• Observe the speed limit: Driving within the speed limit not only ensures your safety but also helps optimize gas mileage.
• Avoid idling: If you anticipate being stationary for more than a minute, such as at a train crossing, turn off your engine to conserve fuel.
• Reduce drag: Remove roof racks, bike carriers, and any other items that create excess wind resistance. This can improve aerodynamics and increase gas mileage.
• Keep tires properly inflated: Check tire pressure regularly and maintain the recommended levels. Underinflated tires increase rolling resistance and decrease fuel efficiency.
• Use cruise control: When driving on highways or long stretches of road, utilize cruise control to maintain a constant speed and achieve better gas mileage.
• Minimize unnecessary weight: Remove any excess weight from your vehicle. Extra cargo adds unnecessary strain and reduces fuel efficiency.
• Maintain regular vehicle maintenance: Follow your vehicle’s recommended maintenance schedule to ensure optimal performance and fuel efficiency.
• Plan efficient routes: Choose routes that have less congestion, road construction, or frequent stoplights to minimize the impact on gas mileage.
• Consider alternative transportation: When possible, take advantage of public transportation or carpooling to reduce the number of vehicles on the road and save fuel.

Implementing these tips can help you improve gas mileage and save on fuel costs during your trip. Remember, even small adjustments can make a significant difference in your vehicle’s overall fuel efficiency.

Now that you have a better understanding of how to improve gas mileage, let’s summarize what we’ve covered in this article.

Calculating gas mileage for a trip is a crucial step in planning and budgeting for your journey. By understanding your vehicle’s fuel efficiency and considering the factors that can affect gas mileage, you can make informed decisions and optimize your fuel consumption.

In this article, we discussed the importance of understanding gas mileage and provided step-by-step guidance on how to calculate it accurately. We also identified the factors that can impact gas mileage, such as driving habits, vehicle maintenance, driving conditions, and vehicle weight.

To improve gas mileage, we shared tips such as driving at a steady pace, observing speed limits, avoiding idling, reducing drag, and keeping tires properly inflated. We also emphasized the benefits of maintaining regular vehicle maintenance and planning efficient routes.

Remember to gather the necessary information, including odometer readings, fuel tank capacity, fuel prices, and trip distance, before calculating your gas mileage. By utilizing the formula and repeating the calculation process, you can obtain a reliable estimate of your vehicle’s fuel efficiency.

With this knowledge, you can make informed decisions about refueling during your trip and adjust your driving habits to maximize fuel efficiency. Not only will this help save money on fuel expenses, but it will also contribute to reducing your environmental impact by conserving energy and reducing carbon emissions.

Now that you have the tools and tips to figure out gas mileage for your trip, start planning your journey with confidence. Safe travels and enjoy the adventure while keeping your gas mileage in check!

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Out of the 50, 37 US states have toll booths for turnpikes, bridges or other toll facilities . The major ones include New York, New Jersey, Florida, California, Texas, and Puerto Rico territory. 13 of the US states and the District of Columbia do not have any toll roads .

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The Simple Formula For Calculating How Much Gas Will Cost On Your Road Trip

T he idea of hitting the open road and enjoying an adventure without daily responsibilities included can be endlessly exciting. Yes, a road trip enjoyed alongside family and friends can feel liberating, but when it comes to your travel budget, the story might be a little more restrictive. Somehow, road trips have a way of adding up to totals beyond what travelers initially anticipate.

Between the cost of lodging, food, and the souvenir shopping to be done along the way too, things can understandably get pricey. It's not uncommon for it all to be more than you bargained for. One of the big hitters when it comes to your road trip budget is typically the amount you'll spend on gas.

Fluctuating gas prices from city to city and between states only add to the confusion. This makes having a plan in place before you get behind the wheel a good idea. While you can't control the price of gas, you can closely calculate what you'll spend by using a simple four-step process.

If you plan in advance, there's room to focus on the road trip fun ahead once you set off. You'll have a budget you can work with that won't cause added stress too. To calculate how much gas will ultimately cost on your road trip, you'll need to look at the gas mileage on your vehicle, how far you're traveling, and the gallons of gas required.

Start With Vehicle Fuel Efficiency And Miles You'll Travel

The first step in calculating how much gas will cost on your road trip is determining how many gallons of gas per mile your vehicle uses. Start by looking up your vehicle's fuel tank capacity which is found in the owner's manual. From here, it's easy to reset your trip odometer, fill up your tank and take note of how far you've gone when it's time to refill again.

It's important to remember that how you drive can make a difference in how your vehicle burns fuel during a road trip. City driving comes with a lot of stop-and-go traffic which uses more gas more quickly. Extended stretches of highway and interstate driving can make gas go farther.

When figuring out the gallons per mile on your vehicle, make sure to use the driving techniques you're likely to use on your road trip for a more accurate picture of gas mileage. If you have multiple vehicles, it's worth your while to test them all. The more fuel-efficient model is going to save you money in the long run.

Step two is to take a look at the total distance you anticipate you'll be traveling. Modern apps like Google Maps make this a fairly quick and easy task. While you might not know exactly what all of your side stops will be, consider adding in a few you think you'll be making to get a more accurate mile count.

Gallons Of Gas Give You The Cost You've Been Looking For

The third step in this calculation is to note current gas prices. This is going to fluctuate everywhere you travel, but using the national average is a useful point of reference for this cost equation. AAA has an easy-to-view national gas price log that adjusts daily. The U.S. Department of Energy also provides a gas price map where costs can be broken down by state and city.

The final step in calculating your road trip gas costs involves some easy math. Begin by dividing your total trip miles by your vehicle's miles per gallon. The answer is the total gallons of gas your journey is going to require.

Multiplying the total gallons of gas needed by the national gas price average will result in an accurate estimate of what you'll spend on gas during your trip. Having this number available will help you budget more efficiently. It will also give you the freedom to worry less about overspending along the way.

You can't control or even plan out every little detail of a trip . You most likely wouldn't want to anyway when unexpected adventures are often half the fun of a road trip. However, the cost of gas isn't something you have to leave to chance when you have this handy calculation available. Put it to use and feel free to let the exploring officially begin.

Read this next: Safety Items You Should Pack For Your Next Road Trip

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FIND GAS PRICES AND STATIONS NEAR YOU

With gas prices on the rise in the United States, finding the cheapest gas prices near you is top of mind when it's time for your next fill-up. Using the Fuel Price Finder, you can find the latest gas prices in your local area. Prices are updated daily.

Use the AAA Gas Price Finder to find gas stations and the cheapest gas in the area near you. Simply type in your city, state, and ZIP code to find the most up-to-date fuel prices in your area.

Taking a road trip soon? Use the AAA Gas Cost Calculator to plan out your fuel cost.

Fuel Finder

Fuel price finder.

Data For 03/25/24 Summary Excerpt: Regular Gasoline Retail Price (Dollars per Gallon) 3.523 .. U.S. 3.388 ... East Coast 3.319 .... New England 3.461 .... Central Atlantic 3.357 .... Lower Atlantic 3.406 ... Midwest 3.176 ... Gulf Coast 3.292 ... Rocky Mountain 4.460 ... West Coast 4.088 ... West Coast less California States 4.801 .... California 3.012 .... Colorado 3.429 .... Florida 3.289 .... Massachusetts 3.332 .... Minnesota 3.353 .... New York 3.418 .... Ohio 3.177 .... Texas 4.278 .... Washington Cities 3.278 .... Boston 3.968 .... Chicago 3.437 .... Cleveland 2.978 .... Denver 3.109 .... Houston 4.769 .... Los Angeles 3.481 .... Miami 3.294 .... New York City 4.896 .... San Francisco 4.441 .... Seattle On-Highway Diesel Fuel Retail Price (Dollars per Gallon) 4.034 .. U.S. 4.125 ... East Coast 4.321 .... New England 4.294 .... Central Atlantic 4.042 .... Lower Atlantic 3.986 ... Midwest 3.717 ... Gulf Coast 3.986 ... Rocky Mountain 4.666 ... West Coast 4.173 ... West Coast less California 5.224 .... California

AAA’s Top 10 tips for saving money on gas.

• Maintain car care – Take your vehicle in for a bumper-to-bumper ‘health check’ to make sure it is running at peak fuel efficiency.
• Adjust your driving behaviors – Avoid ‘jack rabbit’ stops and starts and slow down. Speeding uses more fuel. Best fuel efficiency is around 50-60 mph.
• Limit your time behind the wheel – Consider consolidating errands to make fewer trips.
• Use the right gas – AAA research shows that Americans waste billions of dollars each year ‘treating’ their vehicles to premium gas with no benefit whatsoever. Only use the octane recommended by the vehicle manufacturer.
• Make sure your tires are properly inflated – Tires that are underinflated increase drag, using more fuel.
• Shop around – Gas pricing can vary dramatically corner to corner, county to county. Use the AAA app or the AAA Fuel Finder to locate the least expensive gas near you.
• Map it out – As you make plans for that Great American Road Trip, use the AAA Gas Cost Calculator to determine your fuel costs so you can budget accordingly.
• Sign up for the AAA Shell Rewards program – Save 30 cents/gallon on your first fill-up and 5 cents a gallon after that using the AAA Shell Fuel Rewards program.
• Fill up, don’t break down – In recent months, ACA has noticed an increase in ‘out of fuel’ calls across most of our footprint. As painful as the pump price might be, running out of gas can be even more costly and also put you and your passengers at unnecessary risk.
• Rethink your commute – Consider walking, biking, carpooling or using mass transit when possible. Take advantage of the opportunity to work from home.

Finding the cheapest gas prices isn't the only way to save money on gas. There are other great ways to make sure you're using as little gasoline as possible.

Be sure your car is properly maintained. A faulty oxygen sensor in your engine can wipe out 40% of your fuel economy. After a proper tune-up, drivers see an average of 4% increases in fuel efficiency, according to the US Department of Energy. Want some help with that? Schedule an appointment at a AAA Car Center center to get a thorough checkout. Inflate your car tires to the maximum safe limit specified by your vehicle manufacturer. Underinflated car tires may provide a slightly more smooth ride, but at the expense of lower fuel efficiency. For every 1 PSI under the recommended maximum limit, you lose 0.2% of your gas mileage. If your tires will support 38 PSI and you're riding around at 28 PSI, you could be losing 2% of your gas mileage. Get the correct motor oil. The wrong motor oil can reduce gas mileage and gas savings by 1-2%, like using 10W-30 motor oil in an engine designed to use 5W-30 or 5W-30 in an engine designed for 5W-20. Be sure to look for motor oil that says "Energy Conserving" on the API performance symbol; energy-conserving motor oil will help engine performance.

For more ideas about improving gas mileage, check out these articles on The Extra Mile:

Know the difference between premium and regular fuel How much does traffic congestion cost you? Should you really top off your gas tank?

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• Per Diem Lookup

Privately owned vehicle (POV) mileage reimbursement rates

GSA has adjusted all POV mileage reimbursement rates effective January 1, 2024.

* Airplane nautical miles (NMs) should be converted into statute miles (SMs) or regular miles when submitting a voucher using the formula (1 NM equals 1.15077945 SMs).

For calculating the mileage difference between airports, please visit the U.S. Department of Transportation's Inter-Airport Distance website.

QUESTIONS: For all travel policy questions, email [email protected] .

Have travel policy questions? Use our ' Have a Question? ' site

PER DIEM LOOK-UP

1 choose a location.

Error, The Per Diem API is not responding. Please try again later.

No results could be found for the location you've entered.

Rates for Alaska, Hawaii, U.S. Territories and Possessions are set by the Department of Defense .

Rates for foreign countries are set by the State Department .

2 Choose a date

Rates are available between 10/1/2021 and 09/30/2024.

The End Date of your trip can not occur before the Start Date.

Traveler reimbursement is based on the location of the work activities and not the accommodations, unless lodging is not available at the work activity, then the agency may authorize the rate where lodging is obtained.

Unless otherwise specified, the per diem locality is defined as "all locations within, or entirely surrounded by, the corporate limits of the key city, including independent entities located within those boundaries."

Per diem localities with county definitions shall include "all locations within, or entirely surrounded by, the corporate limits of the key city as well as the boundaries of the listed counties, including independent entities located within the boundaries of the key city and the listed counties (unless otherwise listed separately)."

When a military installation or Government - related facility(whether or not specifically named) is located partially within more than one city or county boundary, the applicable per diem rate for the entire installation or facility is the higher of the rates which apply to the cities and / or counties, even though part(s) of such activities may be located outside the defined per diem locality.