I was wondering if anyone tested their Auto start function of the 2011 C to see if they were actually saving fuel? Most Government testing would not include this type of feature into their official fuel consumption (I would assume). I went on the Canadian Porsche website and they had the 2011 Cayenne fuel consumption listing as follows:

READ: Type : liters per 100km / US mpg

C Man Trans. (no auto start function)
city : 15.9 / 14.8
Hwy: 8.4 / 28
comb: 11.2/21

C Auto Trans.
City: 13.2 / 17.8
Hwy: 8.0 / 29.5
Comb: 9.9 / 23.7

CS
City: 14.5 / 16.2
Hwy: 8.2 / 28.6
Comb: 10.5 / 22.4

CT
City: 16.2 / 14.5
Hwy: 8.8 / 26.7
Comb: 11.5 / 20.4

If you have not tested your auto start function for fuel economy, please comment on the accuracy of the listed fuel consumption.

Thanks
Brez

 

Did you get that right? Seems like the city and highway figures are transposed.

 

The first number is litres / 100km, second ones are miles per gallon. They are correct...

 

I tracked the highway mileage with the computer and manually on 2011 "S", I got 24.5mpg highway with 4 adults and their luggage through mountains of PA. I was dazzled! As for the auto stop feature, I turn it off in NYC since it is annoying stopping and starting at every red light. I don't know City consumption, hard to say if I get 16mpg.