One idea would be to have an overall Top Ten list that everyone is a part of (which would show up on the main page) and then have a page of various top ten's by category.
Users vehicles could default to uncategorized (which would limit them to the overall list) until they specified a category in the vehicle profile, in which case they would be in both the overall list and their specific list. The specific list would still have to be pretty static though.
You all may be way ahead of me on this, but that's my 2-cents :-)
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