AccuFuel makes pretty graphs and works well with multiple vehicles. I live by the USA/Canada border and often fill up in either country, so I appreciate that AccuFuel allows you to change your fill up units. Its also nice to have the option of exporting via email rather than relying on a companys servers.
Only complaints are that the UI is sometimes buggy and wont let me change settings for a vehicle. Also, the app collects the price per unit of fuel, but doesnt do anything with the data. All you can do is export it to Excel and manipulate data there.
Kd7iwp about AccuFuel