Just FYI, I have been using Fuelly since 2008 and have never downloaded an app or paid for anything. You can use text messages to fuel up remotely if you don't want to use the site through a web browser. I did it this way for years before I had a smartphone and still do it this way today since it's so quick and simple.
Hopefully they start keeping the site up to date with new models though. I
The owner of Fuelly is Andy Robinowitz in Southlake, TX. He's more interested in playing in the RV market than he is in supporting Fuelly anymore.
Don't plan on Fuelly ever being updated and maintained. It's a ghost site for all intents and purposes. I know I'm discontinuing using the site, and I encourage everyone else to do the same.