Just look at the histograms and you can see that there are no systematic abuses of the MPG data. Unless you want to postulate that some conspiracy theorist (Honda, Hyundai) have hired all fuelly users for their vehicles and have crafted a realistic histogram at an elevated MPG level (or for Hyundai, at a reduced level).
Also, fuelly.com takes steps to reduce competition - for example, by never comparing or ranking vehicles directly. This is described in their website forum (as a FAQ response).
Yes, abuses can occur. But you'll need more evidence to discount this set of data.
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