Take a look at your Log Book-
http://www.fuelly.com/car/volkswagen...dam/271723/log
Your latest fill-up on Jun 23 2014 has an odometer reading of 222,850.
That odometer is less than your first fill on Feb 28 2014 which was at 225,982.
Fuelly will sort by Odometer reading (because, ideally, that should be the best way to keep things in order) so it's showing a difference of 3,132 miles between those 2 odometer readings. Divided by the the 13.57 gallons you used, gives you the 230 MPG you see.
Edit your last fill-up to be correct, and all should get calculated correctly from there.
Let me know if you have any other questions!
__________________