Any journey I can get cruise on for a period of time I'll get just over 30, but it doesn't take much for me to be down below 20 mpg . Saying that mine is slammed at the moment so less drag possibly, will see what happens when I get oem suspension on it.Hmm, tried a frugal 70 mile run in my M3 on Friday, albeit in ridiculous rain and only got it up to 31mpg at about 70mph. Surprised you're able to get 33mpg.