I have a '13 2.8 with about 1600 miles. Most of my miles are from my daily communte which is half highway. Since the first tank, which include a few hours of idling in my driveway playing with iDrive, I have been getting around 25MPG. For my last tank, the computer said 25.2MPG, I caclulated the MPG at 24.9; so overall I have been happy so far.
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