MotoOne pretty much nailed it. I have 8k miles on my 5.0. It does surprisingly well on the highway because of the 8 gears. I can get in the low 20's if I reset the computer on the highway.. like around 21mpg or 22. It doesn't matter how fast you go because at 80mph you are only pulling right at 2k rpm.

I have 16.9 overall average since new. That is at an average speed of 35mph. So not bad at all.

However, if you tip into the throttle, you will burn gas, BIG TIME!

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2011 X5 5.0
2010 135i Sport Convertible
2011 335i Sport
2011 135i Sport