Useful data. Why not use an online service like spritmonitor.de? Then others can see all of your fuelling data, and compare it with other cars. See the "fuel log" link on my sig for the last 41k miles of my data (petrol/LPG). If you create an account, you can set it to show English and real units. :L
If your app has an export function, you may be able to upload your data to date to that system.
If your app has an export function, you may be able to upload your data to date to that system.