So there I am reading the latest copy of CAR magazine, the BMW E drive looks good at 40k mild electric and returning an average of 34 mpg, 34! I then go out on a trip in my 2.0 TDI Avant smoker, wifey and a couple of weekend bags. We do 90 miles and on the way back I check the efficiency, 56.4 mpg! In a 11 year old car which cost buttons and is as comfortable as you like. Someone tell me what's going on...?