Jason, I really like the graphics you've added to the milage database.

The graphs provide a nice positive feedback to the people pumping frequent data into the system rather than posting one sweet tank.

So far only a few users posted data for last year. (I got my Prius Dec 31, so all my fillups have been this year). Eventually, you might want to rotate the monthly graph so the current month is displayed all the way to the far right. That way you could show the 11 previous months in unbroken order.

Also, it would be nice if the per car download stuck the car ID in as part of the filename, so it doesn't accidently replace the full database download.