I get 16.5 mpg on my 35i. I plan to order the new body style x5d 4th quarter of next year as a 2014 model. I had the opportunity to have two x5d for a week at a time will servicing my car and I got around 24 mpg so was very impressed.
14 Lexus GX460 & 14 Lexus ES300H
14 BMW 528d Touring Estate - UK
11 BMW M3 JZB ZCP 6MT, 02 BMW M3 Conv 6MT & 02 BMW M3 Coupe 6MT