# How is fuel efficiency calculated?

Fuel efficiency is calculated automatically based on the mileage and fuel volume you enter.

Calculation formula:

(Current odometer − Previous odometer) ÷ Fuel volume = Fuel efficiency (km/L)

We also provide an automatic mileage calculation feature to make this easier.

For the site tree, see the [root Markdown](https://slashpage.com/fuellog.md).