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They are rolling road and they are done by the car manufacturers themselves to set of rules. You never get an average very close to the official figures but they do provide a pretty good comparison from one car to another. I'd be happy with anything over 40 mpg for mixed driving
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F25 xDrive20d SE __ professional multimedia package | dynamic package | climate package | 309s | xline | xenons | electric seats | folding mirrors | business speakers |