Even driving 'normally' there will be big differences in mpg depending on the type of journey you normally do, the type of fuel you use (95 or 99RON) and the type of gearbox you have.
For me, I'm happy with 33mpg on average. Mostly 30 minute+ journeys, 99RON, manual.
I get 40+ most days on my way to/from work. I 'save' this up and burn it all away at the weekend.