If you reset your gas milage meter and just drive around town in stop and go traffic in 1st, 2nd and 3rd gear you will see the mileage you are getting. A quick check to see if your engine is performing properly is to drive out to a level straight highway, reset the meter and cruise along at 60 - 70 mph, you should see better than 20 mpg. Good luck

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2013 X5 3.5i M Sport
2004 M3 cabriolet SMG