33MPG is very, very good.  Now let see more than few KM of distance covered.  I'm certain I could find a long downhill stretch in Austria and get excellent mileage over a short stretch...  just saying, even my old Turbo can get 50mpg going downhill at 65mph.  Let us see you take a long trip, at least 100km and see if the mileage hold up.  If you can get over 25mpg over 100km I will be impressed.    Not that I am complaining, I have been singing the praises of good mileage by insanely fast production 911s for years.

Dang I miss Austria,  - do you have to take such excellent pictures!  Thanks a million!