I am sure the 3.0 gets much better milage as I've driven a 3.0 for a week while they were fixing my DVD player in the 4.8.. I noticed a big difference in how fast that fuel gauge goes down!

I'm getting about 14 mixed driving (phoenix has a lot of 45mph zone large streets, so it's not like a true urban setting with lots of stop and go).

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BMW - X5 4.8i w/all US options packages, 19" Y wheels, White/Tobacco, Huper Optik 50% tint
Mercedes Benz - E320 CDI Park Assist, NAV, Folding Mirrors, Premium Sound, Voice Command, Sunroof, Auto Rear Shade, Bi-Xenon