I use the miles divide by tank fill up and in winter I average 14 mpg(50% city, 50% highway). In the summer I can get it up to 18 mpg easily. Accelerating pretty hard both times.

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RIDES
2005 BMW X5 4.4i Toledo Blue...RIP
Foose Edition S/C Ford F150 #0238
Chevrolet Trailblazer SS
Ford Mustang SVT Cobra