When I filled up today I did not set the city/highway balance correctly. When I went back to edit this most recent fill I was presented by a zoomed in view in which I was not able to move the city/highway slider farther to the right than 30%. The screen would not zoom and panning did not help either. This is a small nit as I was able to edit it online later but still...
Sorry you're having trouble.
This was posted in the aCar section, but it sounds like you may be referring to the Fuelly Web App.
We've been receiving reports of the viewing of the main site (when you click on Edit, it takes you away from the mobile site- m.fuelly.com to the main site- www.fuelly.com.
BUT this is only when using the mobile web app.
We're looking into better optimizing the main site for mobile devices, but for now, you can either bookmark and use m.fuelly.com in a regular browser window on your device, or as you did this time, make your edits once you're near a computer.