The problem with getting rid of data is twofold: you're decreasing sample size/increasing error and you're throwing out good information. Data may be old-ish, but there's nothing wrong with it.
Imperial gallons are converted to US gallons in the database, so that isn't an issue. I could print the "last updated" date on the tables, but that could make our information look out-of-date and unusable. It isn't. I even tested taking out all cars with less than 3000 miles and seeing if the overall mileage figure changed; it didn't for any vehicle by more than 1 MPG.
I think the main issue is that fuel economy is viewed as a sort of "contest," which is exactly what it should NOT be. The second members start competing to do better, GreenHybrid looses its credibility as a reliable source of information. It will be dismissed as a sample of only the "cream of the crop" hypermilers.
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