They are slow in the standard form. MPG isn't brilliant stock either, 300 miles of urban driving per tank and 400 motorway miles. but bear in mind my urban driving is mainly traffic free. The most i see out of the car is 425-450 if you take it easy, the worst is 280 that included hard town driving and sppeds in excess of 120mph on the motorway. When i refill i put in 50 litres, so this can give you an average.
My car has got better on fuel since i had a Superchip fitted, removed the car and installed a larger bore diameter exhaust from the manifold back; i have been told these help to spool the turbos up quicker. I also run a k&N air filter, don't know if it adds power but certainly adds a more aggresive note.
