I used an OBD2 wifi dongle and Dash Commander on the iPhone to monitor economy on my 2.4 Type S tourer, and below are my findings;
* 28mpg round town (average traffic levels, I.e. not London)
* 34-35 mixed (bias towards a and b roads though)
* 35-37mpg motorway (70-80mph, no AC, slowing on...