[MetroMPG]

I applaud you, Peakster.

And to answer your original question, Doofus:

TomO suggested I add a widget to the fuel log that compares your cumulative savings based on the combined EPA figure for your vehicle. It's not going to be 100% accurate, but it sort of levels the playing field (and doesn't require people to know what they were getting before they changed their started modding their technique & vehicle).