Z3 M roadster fuel consumption

[Z3Mroadster]

Hello.
Which fuel consumption is normal for M roadster on the open road,out of town,normal driving?
Engine is s50b32-321PS .
Let's say,which fuel consumption is with normal driving,80 km/h in 4th gear?

I noticed there was punctured flexible hose exhaust (part on picture),is it possible that because the car has less power, poor acceleration and higher fuel consumption!?
http://i73.photobucket.com/albums/i217/andrewturner/photo-1-3.jpg




Thank you.

 

[z3cade]

Long journeys I get 28mpg otherwise expect less

 

[Aceman]

Hi Andrew,

Is the exhaust blowing then from the flexi joint as I am sure it will have an effect on power/economy if it is. I get around the same as Liam with high 20's on a run to low 20's around town and spirited driving.

Ohh added the picture to your post saving people having to click the link.

 

[Mr-P]

On a 2,500 mile road trip last year to Scotland turned in 26mpg
Everyday use around 22mpg
When on the track real lucky if I see 8mpg