Useful answers, in plain language.
Learn what the results mean, how the calculation works and where a little care makes a difference.
How to calculate fuel cost for a trip
Use distance, fuel economy and the price of the fuel you expect to buy.
Trip planning guideUS MPG vs. Imperial MPG
A gallon is not the same volume in both systems.
Trip planning guideMPG and L/100 km: opposite directions
Higher MPG is better economy, while lower L/100 km is better economy.
Trip planning guideHow to split fuel cost between passengers
Decide what is shared, then divide the same trip total fairly.
Trip planning guideEstimate a commute fuel budget
Turn a single journey into a repeated-trip estimate without double-counting.
Trip planning guideUse measured fuel economy for a better estimate
A realistic input often improves a trip estimate more than extra decimal places.
Trip planning guideIs a detour for cheaper fuel worth it? Calculate the break-even point
Compare pump savings with the extra fuel used on a detour, using worked US and metric examples and clearly stated assumptions.
Trip planning guideCompare annual fuel costs between two cars
Compare vehicles using the same distance and fuel-price assumptions, understand why equal MPG gains save different amounts, and test a fuel-only break-even.