How Much Does a Road Trip Cost in Gas?

01 The Road Trip Fuel Cost Formula

A 1,000-mile road trip costs between $84 and $163 in fuel (at about $2.94 per gallon) depending on your vehicle's fuel economy: roughly $0.084 per mile in a 35 MPG sedan versus $0.163 per mile in an 18 MPG pickup truck. Calculating road trip fuel cost requires three inputs: distance, your vehicle's fuel economy (MPG), and the price of gasoline. The formula is straightforward:

The key variable most drivers underestimate is real-world MPG versus EPA ratings. Highway-heavy road trips typically achieve MPG closer to the EPA highway rating, which averages 5-15% higher than the combined city/highway figure. However, factors like speed, elevation changes, headwinds, and cargo weight can reduce real-world economy by 10-20% from the rated figure.

For the tables in this article, we use EPA combined MPG ratings for three representative vehicle types: a midsize sedan at 35 MPG, a standard SUV at 25 MPG, and a standard pickup truck at 18 MPG. The gas price used is the EIA national average, which has ranged from roughly $2.90 to $3.80 per gallon for regular unleaded over the past two years.

02 How Far Americans Actually Drive on Road Trips

The tables above use round hypothetical distances (250, 500, 1,000 miles) to illustrate the formula. But how far does the average road trip actually go? The Federal Highway Administration's 2022 National Household Travel Survey asks respondents to log their long-distance trips (defined as 50 or more miles one-way), which makes it possible to answer that with real data instead of a guess.

Filtered to trips taken by personal vehicle and weighted to be nationally representative, the median one-way distance is just 107 miles, a day trip, not a cross-country haul. The average (mean) is pulled higher, to 212 miles, by a long tail of much longer trips. Nearly half of all road trips (48%) are under 100 miles one-way, while trips of 1,000 miles or more, the kind that dominate popular imagination of a "road trip," make up only about 3%.

03 Cost by Trip Distance

The table below shows estimated fuel cost for common road trip distances across three vehicle types. Costs are shown at two gas price points: $3.00/gallon (representing a low end) and $3.50/gallon (a moderate level), reflecting the range most U.S. drivers encounter.

The difference between vehicles is dramatic. On a 2,000-mile trip, a truck driver spends $162 to $189 more than a sedan driver. Over a round trip, that gap doubles to $324-$378. For families planning multiple road trips per year, vehicle choice is one of the largest controllable fuel expenses.

04 Popular Route Costs

The following table shows estimated one-way fuel costs for some of the most-driven road trip routes in the United States. Distances are approximate and based on primary interstate routes.

The cross-country trip from New York to Los Angeles -- roughly 2,790 miles via I-80 and I-76 -- is the most expensive common route, costing $259 to $504 one-way depending on vehicle type. A round trip in a truck at current gas prices can easily exceed $1,000 in fuel alone.

05 State Gas Price Variation

Gas prices vary substantially by state, which can significantly affect the total cost of a long road trip. As of recent EIA data, the spread between the cheapest and most expensive states has typically ranged from $0.50 to $1.50 per gallon. States like Mississippi, Texas, and Oklahoma tend to have the lowest prices, while California, Hawaii, and Washington tend to have the highest.

On a cross-country trip, you may pass through 8-12 states with meaningfully different prices. For a trip from the Northeast to Florida, prices generally decrease as you head south through the Mid-Atlantic and into the Southeast. For a trip from the Midwest to California, prices often increase sharply once you enter California due to higher state gas taxes and regulations.

06 Reducing Your Road Trip Fuel Cost

The Department of Energy has published extensive research on driving behaviors that affect fuel economy. Several of these apply directly to road trips:

• Speed matters: Fuel economy decreases significantly above 50 mph. Each 5 mph above 50 mph is roughly equivalent to paying an additional $0.15-$0.30 per gallon, according to DOE estimates.
• Remove excess weight: An extra 100 lbs in your vehicle reduces MPG by about 1%, according to EPA testing. Roof cargo carriers reduce fuel economy by 2-8% in city driving and 6-17% on the highway.
• Maintain tire pressure: Properly inflated tires improve fuel economy by up to 3%. Under-inflated tires are common and can reduce MPG by 0.2% for every 1 psi drop.
• Use cruise control: Maintaining a steady speed on the highway improves fuel economy by reducing unnecessary acceleration and braking cycles.

These factors combined can swing road trip fuel costs by 15-25%. A driver going 75 mph with a loaded roof rack will spend meaningfully more than a driver going 60 mph with all cargo inside the vehicle, even in the same car on the same route.

07 Data Sources

1. Federal Highway Administration / Bureau of Transportation Statistics: 2022 National Household Travel Survey, public-use long-distance trip file. nhts.ornl.gov
2. U.S. Energy Information Administration: Weekly Retail Gasoline and Diesel Prices. eia.gov
3. U.S. Environmental Protection Agency: Fuel Economy Guide, Model Year 2024. fueleconomy.gov
4. U.S. Department of Energy: Driving More Efficiently / Fuel Economy Tips. fueleconomy.gov
5. Federal Highway Administration: National Highway System Route Mileage and Motor Fuel Tax Rates. fhwa.dot.gov