GASOLYTICS

Trip Gas Cost Calculator

How much will gas cost for your drive? Pick your cities (or type your miles), set your MPG, and get a fuel estimate from published AAA state averages (updated 10/20/26).

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Compare published averages: gas prices by state · diesel prices by state.

Road-trip fuel questions

How is the trip gas cost calculated?

Distance ÷ your vehicle's MPG = gallons needed, multiplied by the average of the origin and destination states' current price for your fuel grade (AAA daily averages). If you don't type an exact distance, we estimate driving distance as straight-line distance times a typical road factor of 1.18. For example, a 300-mile one-way drive at 30 MPG uses 10 gallons. At a hypothetical $3.50 per gallon, that costs $35 one way or $70 round trip. These are sample inputs; the calculator uses your inputs and published state prices.

How do I lower the cost of a road trip?

Fill up in the cheaper state — border differences can reach 60¢ or more per gallon, which is $9+ on a 15-gallon tank. Check both states' pages before you leave, and top off before entering an expensive state.

What MPG should I use?

Choose your gasoline or conventional hybrid vehicle by model year, make, model and EPA configuration to use its combined MPG (U.S. gallons). You can also use a quick preset or enter your own measured MPG. EPA estimates are a starting point; driving, weather and loads affect real-world fuel economy. The picker covers U.S. EPA configurations, not every retail trim or international model.