Estimate the fuel cost of a trip from distance, efficiency and fuel price.
In imperial units, fuel used equals distance divided by miles-per-gallon; in metric, it's the distance in hundreds of kilometers times your L/100km figure. Multiply by fuel price for the total trip cost.
Imperial (MPG)
Fuel (gal) = Distance (mi) ÷ MPG Cost = Fuel × price per gallon
Metric (L/100 km)
Fuel (L) = (Distance (km) ÷ 100) × L/100km Cost = Fuel × price per litre
Check your vehicle's trip computer or manufacturer rating. In the U.S. it's miles per gallon (MPG); in much of the world it's liters per 100 km.
Yes — just enter the total distance for the whole journey, including the return leg.