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for mostly freeway driving I am getting close to 15mpg (on X6 5.0i).
I don't doubt it when you are crusing on the freeway, reset the mpg computer and gets 20mpg reading. But if you reset mpg, at the garage even on long trip on interstate and see the mpg when you arrive at the destination, I doub't you even get close to 20mpg. It's the method of measurement that counts as much as driving style, just so that we are comparing apple-to-apple.
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