Another echo ... groups would be great because I can get more people to join up if they feel a sense of camaraderie about the whole fuel-logging experience, and get competitive about it.
This is why I wish there was a top-10 (for each car class) etc, but I realize (your concern that) that folks would tamper with numbers! Perhaps throw in some statistical metrics - minimum 25 fuelups, reasonably/evenly spread apart, no deviation greater than norms etc etc.
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