Why is my actual fuel cost higher than predicted?
Most drivers get worse MPG than EPA estimates due to aggressive acceleration, speeds above 60 mph, cold weather, or heavy cargo. Use actual tank-fill calculations.
Automotive
Road Trip Fuel Cost Calculator
Calculate total fuel costs and divide them among passengers for a big trip.
Share Travel Costs Fairly
Know exactly how much fuel you'll need and split costs if you're traveling in a group.
$
What this calculator does
A road trip fuel cost calculator estimates how much you'll spend on gasoline for a long-distance drive and distributes that cost among passengers. Fuel is often the largest variable expense on road trips.
How it works
The calculator divides total trip distance by your vehicle's fuel efficiency (MPG) to determine gallons needed, then multiplies by fuel price. It divides among passengers to show per-person expense and estimates fuel stops based on tank capacity.
Formula
Fuel Gallons = Trip Distance ÷ MPG. Total Fuel Cost = Gallons × Fuel Price. Cost per Person = Total Cost ÷ Passengers. Estimated Fuel Stops = (Gallons ÷ Tank Size) − 1.
Tips for using this calculator
- Use your actual fuel efficiency from recent fills, not EPA ratings
- Check fuel prices along your route; prices vary significantly by region
- Highway driving at steady speeds improves efficiency 20-30% vs. city driving
- Tire pressure affects fuel economy—check before long trips
- Plan fuel stops strategically to avoid highway premium prices
Frequently asked questions
How much does driving speed impact fuel cost?
Fuel efficiency decreases sharply above 60 mph. Driving at 70 mph versus 55 mph typically reduces MPG by 15-20%.
Should I fill up before leaving?
Fill up before leaving if prices near your start are competitive. Fuel prices often increase near highways and tourist areas.