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Generated on July 28, 2026 at www.simpliutili.com
Enter the one-way distance, your vehicle's expected miles per gallon, and the fuel price per gallon. The tool estimates gallons used, one-way cost, round-trip cost, and fuel cost per mile.
Gas Cost = (Trip Distance / Vehicle MPG) * Price per GallonWhere Trip Distance is the total miles to and from your destination, MPG represents your vehicle's average fuel economy, and Price per Gallon is the cost of fuel.
Determine the total driving Trip Distance in miles (include round-trip routes).
Find your vehicle's average Miles per Gallon (MPG) rating.
Divide the distance by your MPG to find the Total Gallons of Gas Needed.
Multiply the gallons by the local Average Price per Gallon to calculate your final fuel cost.
Fuel volume is estimated by dividing trip distance by vehicle fuel economy. That volume is multiplied by the fuel price entered, with optional round-trip and passenger splitting.
Real fuel use varies with speed, traffic, terrain, weather, cargo, tire pressure, and idling. The result excludes tolls, parking, maintenance, and depreciation.
Reviewed July 28, 2026
Gallons needed: Divide the entered distance by expected fuel economy.
One-way and round-trip cost: Compare both without repeating the calculation.
Fuel cost per mile: See the variable fuel portion of the drive.
Editable assumptions: Replace the defaults with a route-specific distance, vehicle MPG, and local price.
Vehicles are engineered to be most fuel-efficient when cruising between **50 and 60 mph**. Driving faster (e.g. 75 to 80 mph on highways) increases aerodynamic drag significantly, dropping your fuel economy by 10% to 15%.
To split gas money fairly, calculate the total fuel cost for the trip using our tool, then **divide that amount equally by the number of travelers** (including the driver). You can also add a small buffer to cover highway tolls.
To improve MPG on a trip, **check your tire pressure** before departing (under-inflated tires drag MPG down), remove heavy unnecessary cargo, maintain a steady speed using cruise control, and avoid rapid accelerating.
Traffic, idling, speed, terrain, weather, cargo, tire pressure, and detours all affect fuel economy. Add tolls, parking, maintenance, and other vehicle costs separately.
To see how much your routine office commute costs you in fuel and maintenance every single month, try our Daily Commute Cost Calculator for a full vehicular cost analysis.