Fuel Cost Per Mile at $3.50 Gas and 30 MPG

Driving a 30 MPG car with gas at $3.50 per gallon costs approximately $0.117 per mile in fuel.

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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.

A 30 MPG vehicle is considerably more economical than average — calculate your exact per-mile fuel cost at current gas prices.

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.