Obviously mpg jumps about subject to road conditions and your mood; presumably most of us aren't interested in driving through cities, but rather villages? I would say that my S1 averages 25 mpg overall and other than a track day shouldn't dip under 20, but if one were to be constant, (on a motorway at legal speeds for example) I should think 30 mpg were possible. The pain in the butt are the slow refuels that 'airlocks' seem to cause at many pumps.
