I haven't calculated manually, but gotten about 400 miles out of 2 tanks of gas Fill about 11 gallons each time), so I'm averaging 18 mpg around town with some spirited driving as I enjoy my new car. Still only have about 425 miles on her. I'm guessing on highway driving I'll get much better, or when I drive in Efficiency mode. But I doubt I'll get better...the M2 craves to be driven hard (not abused), and thats when its most fun (and inefficient).
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