What does this tool do?
In US units, trip fuel cost is distance divided by miles per gallon, multiplied by the price per gallon. This calculator also shows gallons used, cost per mile and the split per traveller.
The Formula
Gallons = Distance ÷ MPG; Cost = Gallons × Price per gallonFrequently Asked Questions
Is MPG measured the same way everywhere?
No. US MPG uses a smaller gallon than UK MPG, so the same car shows a higher UK figure. This calculator uses US gallons.
How much does speed affect trip cost?
A lot above about 60 mph, where aerodynamic drag grows quickly. Reducing highway speed by 5–10 mph can improve real-world economy noticeably.