duplicate vehicle that I can't delete
 

I have a duplicate vehicle in gas tracker that I can't delete. When I try to delete it, I just keep getting a message that says that I can't delete the vehicle at this time. The vehicle does not appear in fuelly online, just in the app.

If the vehicles in Fuelly are correct, then delete and re-install Gas Tracker+. Or you may want to install Gas Cubby Lite (it's close to identical to Gas Tracker+). Eventually, Gas Tracker will be eliminated and replaced by Gas Cubby Lite, this will allow you to avoid any future hassle.