Agreed- skewing the data to those who regularly contribute, as opposed to those who toos in their 1st few tanks, is not a good idea. Most people I know base 'their MPG' off of the 1st couple of tanks when they go the car new, anyway- when it was the new toy to play with. So in a way, the '1st tank off the lot' mpg is more valuable to many consumers. Few are interested in what the FE is a year down the road- they want to know what the instant gratification (or frustration) factor will be.

Although I think its worthwhile to differentiate on the page who the 'active' contributors are, while keeping all the data. It woud be purely cosmetic, and only matter to those who want to know 'where they stand' relative to other active contributors- no effect on the compilation. I think that would satisfy most users.