To prove a point to her indoors I've been messing about with my driving style the past few weeks to see just how much it effects the economy of the Z4. My best economy I have managed is 51.3 on the computer doing 65 behind a van on the M42 and been as carefull as possible, and I managed 347 miles on a full tank of super unleaded. I have also found that I get more MPG if I drive with the sports button on? Just thought I'd see if anyone else has tried this and what results they managed. Oh my worst was 4mpg and that was doing the rev limiter in second.