Entire site reports lower mpgs when UK and Canada users are included
 

UK and Canada lower MPG avg for US settings when viewing average for any make and model.

When viewing such cars as the BMW 335d, I notice that the entire model range for any given year is reporting lower than average when there is a UK or Canadian car in the result set. This means that the average is incorrect for the BMW 335d, and all the Mercedes models, to name a few. There should be a way to convert or exclude UK and Canada from the calculations when I set my account to report US units.

Agreed. I wish you could select the cars you want to track/compare. There are some vehicles that are entered wrong and show their mileage around double that of everyone else. They entered something wrong and haven't bothered to log in, in over 6 months or a year. We don't need to see these cars added in to the mix!

If you are looking at roughly double or half, I'd bet for using the wrong units - miles or kilometers. Those are not exactly half, but near it. If the site is left in default, that is in US miles/gallon, then the number of kilometers is entered along with the number of liters, the result isn't too far off half the correct number.