One feature that I'd like to see: could the add a fuelup form automatically strip out currency characters like the $ ? I always have to remember to remove that myself, but it seems like it would be easy enough to only accept digits, dots, and commas as input for that field so I can throw whatever into it.
Looks good folks. My only question would be, "is there any way the log book can have a switch to show either miles and gallons OR kilometers and liters?" It's taken us folks north of the 49th parallel a little while to think in liters/100 km and now mileage here is being reported in miles per gallon, a bit of a regression for us.
Otherwise, the site looks great and has lots of interesting features.