I checked mine the old fashioned way by dividing the distance driven by the amount of fuel put in. I got 20mpg driving really hard so I'm guessing if I were to take it easy on the X5 then I would've gotten a lot higher.

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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