Incorrect mpg

[DoorDing]

"Difference from full" gives a point of reference for calculating fuel economy. With partial fill ups, there's no point of reference to use for measuring the amount of fuel consumed.

The only way around this would be for the user to manually determine how much fuel was consumed without filling the tank. This isn't a matter of adding a feature to Fuelly; any fuel economy calculations require good data, and partial fill ups don't allow for this on standard vehicles. The only somewhat practical way around this would be to install a very accurate, digital fuel gauge in your vehicle. Doing so would allow manual calculation of the amount of fuel consumed. In my opinion, it's better to just fill up the tank if you're really interested in maintaining a fuel economy log.