Have you actually GOT an on-board computer? What does your clock look like? Is it like a "clock", or is it a digital display? If it's digital, press your indicator stalk IN, and you'll see the different functions (including mpg).I might be being a bit stupid here, I can’t see any mpg figure!
My 3.0 averages 28.5 in similar driving (according to the computer), so it's interesting that all Z3s must be similar mpg, regardless of engine size.My 2.0 averages 27mpg according to the computer, around town and occasional country blast