It is my understanding that fuelly.com bought out GasTracker+ with the intent on developing it as the official app for this site. The app seems to work for the most part and is obviously linked to the site.
However, it crashes when I click Garage and then select 1 of my 2 vehicles. I briefly see the info of the car, then the app closes.
Disappointed that despite this thread in the forum we have received no response from fuelly staff. I'll ask again, do you a projected update to the Gas Tracker app for iOS? You'll have to update it for iOS 7, but would love an update it before then.