Personally I like both the 5 and the A6 better than the X3, and they'd both get better fuel economy than the X and be more comfortable. I don't know about actual fuel economy figures tho, I'm sure a quick google search would yield the results you need.
__________________
E92 335i|Jet Black|Black Dakota|Alu|Step/paddles|ZPP|ZSP|6FL|Navi|Heated Seats|CA
|