Yes I agree totally. Even factors like ethanol in winter gas can have a largeI think "real world" mpg sites like fuelly.com are a better indicator than the U.S. EPA fuel mileage testing for that very reason. I have no doubt that if Canada adopts the same type of testing as the U.S. they'll find the same type of discrepancies that exist here...whether that's better than the current testing methods or not isn't clear. The EPA is telling me that an Elantra will get better mileage on the highway than an Accent and the auto transmission Accent will get the same mileage as the manual? Uhh...I don't think so. Based on posts I read here and elsewhere, that's not the case independent of driving style,conditions, etc. There's an inherent difference for the majority of people that the EPA testing doesn't acknowledge.