Site looks good. Not seeing too many problems, but will point out a couple of things I did notice...
The two tone line position of the background color, seems to be a bit off when the sidebar is hidden. It doesn't line up with aspects of the site, kinda creates an off look to it. Does not affect the function, just a visual thing.
Like the colors. Like the ability to show or hide the side bar, the notes field, etc. Great points. I use this a lot with a netbook, works great.
Only suggestion I can add to, is the city/highway thing. For me, rather than an N/A, I would like to preset it for each vehicle, for my known normal amount as a default, so I can just adjust it for fill ups that actually vary from the norm, rather than have to adjust each and every one. Otherwise I most likely will not be using it.
That's my only thought there.
Everything else appears to be good. Keep it up!
__________________