I've found tried several and found fuellog to be excellent - the best I've tried so far by some way.
It will cope with just about any measurements or units you throw at it. It copes with partial fill ups, plus non-fuel expenses. You can export to csv files. Worth upgrading to pro for long term use or multiple cars.
With any Android app be sure to back up data before removing it from your phone. If you remove an app, the data goes with it.