MileageManagerApp2

The MileageMangerApp2 is a great way track your gas consumption, money spent and Miles Per Gallon among other things. Here are the functions available on the app.
- View Mileage - Can view each fill up since tracking began
- View Summary - Totals accumulated by month
- Sort Data - Data can be sorted on both of the above mentioned screens by clicking any one of the column headings
- Enter Car - Add a new car to track mileage on
- Update Car - Change the default car or delete a car
- Total Stats - Totals since the first entry in the app or by year
- iCloud Processing - Backup and restore data to and from iCloud
To get the most out of this app, make sure to read the help, it goes into detail on what it can do and how. 
Give this app a try and I am confident you will find it a great addition to your iPhone or iPad.