Fuel Economy Converter
One-stop converter between US MPG, UK MPG, L/100km, and km/L — type any one and read the rest.
Fuel math runs on your device — your mileage and fuel prices stay privateTry: Value=25, From unit=us → 25.0, 9.41, 10.63, 30.0
How to use
Pick the unit you already have and the tool shows the others. The US gallon is smaller than the UK (imperial) gallon by about 20%, which is why UK MPG numbers look larger for the same car.
FAQ
Is a higher MPG always better?
For fuel cost and emissions, yes — higher MPG means fewer gallons per mile. But total savings also depend on how many miles you drive and the price you paid for the car.
Why does my car show lower MPG than the EPA rating?
EPA figures are lab estimates. Real driving — cold weather, short trips, highway speeds, heavy loads, and tire pressure — typically lands 10–20% below the sticker.
Do US and UK MPG mean the same thing?
No. The UK (imperial) gallon is about 20% larger, so an identical car shows a higher number in UK MPG than in US MPG. Always check which one a source uses.