Same story as above but we have a 09 and similar mileage average 24mpg long term on the hiway we can get 30mpg. I also have a tune on mine and it really woke it up, the torque is addicting.

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X5M Eisenmann exhaust, de-Catted down pipes, 22" HRE wheels, ECUProgram stage II (700hp) tune
X5 35d Tuned and Lowered