Same issue here. Traveled 459 miles and Fuelly is reporting 68 miles traveled. I don't know why. I went into the incorrect fuel up and the fuel up before it and both have the right mileage listed with no visible data irregularities (no hidden spaces, etc.)
Somehow fuelly is subtracting 191442 from 191901 and getting 68 instead of 459.
Yes, the Golf. I am putting in ODO mileage using SMS. What is indicating that I'm using trip mileage? I have always used ODO but would be interested if something is mis-set somewhere. When I go to edit that fillup it shows ODO.
I deleted the last 4 fuel ups (the one before the problem, the problem, and the latest two after that) and manually re-added them via the web. It is showing the same bad math. Very weird.