My old M3 Evo Convertible did 36MPG on a run at 70MPH in 6th with the roof down. Around town it was getting 20's. Foot hard down you was not getting much but my god didnt it go!, Really good cars for drivers, no massive lump of power which makes them feel not that quick but check the speedo to see just how fast they really are.

Great cars, not many will beat them on the full package.