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I just got rid of my 2012 X6 5.0 with 61k miles and bought a 2014 X6 3.5. I did 90/10 (maybe even 95/5) highway and could not get better than 18.9 mpg. I only have 500 miles on the 2014 3.5 but I am over 20mpg already which should increase to around 24-26 (possibly higher). I am commuting and decided warranty and fuel consumption were more important.
I loved the power and sound of my X6 5.0 for overtaking 50-80mph; in that area you would surely notice the difference. I came very close to buying a bargain basement fully loaded 640GC demo but just couldn't give up the X6. You don't necessarily buy an X6 for fuel consumption but if you are considering economy, then 3.5 is better - For power you have to get the 5.0.
I'm going to pickup an m car for fun and right now the M3/M4/M6 are looking like winners.
Oh and problems - my X6 5.0 was starting to show the costs of the 61k in terms of injectors, transfer case (both had to be replaced) and other engine sundry items/concerns.
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