Fuel Cost Per Mile at $4 Gas and 25 MPG

At $4.00 per gallon and 25 MPG fuel economy, your fuel cost is exactly $0.16 per mile.

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How to use this tool

Enter the current price of fuel per gallon.
Enter your vehicle's fuel economy in MPG.
The calculator returns cost per mile and cost per 100 miles.

With gas at $4 a gallon and a car getting 25 MPG, you pay $0.16 for every mile you drive — see how it changes with your actual numbers.

Frequently asked questions

How do I calculate fuel cost per mile?: Divide the price per gallon by your MPG. For example, $3.50/gal ÷ 28 MPG = $0.125 per mile ($12.50 per 100 miles).
What is the IRS mileage rate?: The IRS standard mileage rate covers fuel, maintenance, and depreciation. For 2025 it is 70 cents per mile for business use. Fuel cost alone is typically 10–20 cents per mile.