US MPG and fuel cost calculator
US pumps sell US gallons (3.785 litres). Enter miles and gallons used, plus the price per gallon.
Estimated result
Fuel cost
Cost per mile
This uses the US gallon, not the UK imperial gallon.
Sources
Note. These tools are indicative. Inspection, emissions and registration rules vary by state. Confirm with your DMV or the IRS before you file or renew.
Frequently asked questions
Is this US or UK MPG?
US MPG. The same trip looks more efficient in UK MPG because an imperial gallon is larger.
How do I improve the estimate?
Use two full-tank fill-ups and the miles between them. Partial tanks skew MPG.
Can the app store this?
Yes. Set miles and gallons in Settings and log refuels — consumption is shown as MPG.
