EngineMilesWhy start full?
The fuel you buy is not always the fuel you’ve already used. If the tank begins and ends at approximately the same full level, the fuel added between those points is a useful approximation of the fuel consumed.
Start your history at a full tank. That first fill establishes the baseline rather than counting as newly tracked consumption.
What if I only buy a little fuel?
Record partial fill-ups too, and turn off “Filled the tank?” for that entry. Later fuel purchases contribute to the running estimate. Between full tanks, the amount bought and the amount consumed can differ because some fuel remains in the tank.
What should I enter?
Record the odometer and fuel amount from the fill-up. Check your units and mark whether the tank was filled. Price, station, and notes are optional. If an entry is wrong, edit it in Log.
More consistent logs, clearer estimates
Missing fill-ups, inconsistent fuel units, changing full-tank levels, or incorrect odometer readings can affect the history and any derived estimates. A later full tank gives another useful boundary; the engine-mile estimate still depends on the gas-only fuel economy you use.
Learn what the estimate means or get started with EngineMiles.