Like Google Trends? Fuelly Trends would be just as cool.
I'd like to see trends in spending & mileage. If you've ever used Google Reader or Google Trends, it's totally fascinating to see when people check things or when and why things become a popular search. Below is an example of trends, of course Fuelly trends would track gas trends and not internet usage.
http://www.google.com/trends?q=Shake...all&sort=0
It would also be interesting to see how seasons (heating and AC usage) affect mileage or how a certain period in time has lower mileage than others and the user can then determine what made it that way.
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