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Don't buy the M5 if you are going to worry about the mileage. I get 16 mpg in normal driving......but it will go to 12 if I exercise it properly. I can get 20 on the highway at a steady 80mph. I do have a Dinan 3.45 rear dif. With the standard rear, 18 and 23 would be more typical.
But hey, with gas so cheap, now is the time!
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