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I have a 2012 535i, I usually drive in Sport mode, I like to accelerate of the light fast, 95% of my driving is in town --- and I consistently do 20.2 mpg. Thermostat and air filter are not the cause of your 9-10 mpg. If I read correctly you just got the car so you do not know the mpg history. Is this based upon a sole 1/2 tank (if so could just be your gauge) or have you been driving it for 2 or 3 full tanks of gas?
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