well, i did some calculations
my 6.9 just returned impressive fuel consumption figures on my long drive, which did include some, but not much stop start driving.
I just filled the car again and put in 82 litres to the top.
from that fuel i got 460k's which equates to 17.83L/100ks or 5.61km/litre
Thats really not that bad.
According to http://www.1728.com/convmlge.htm that's what I get in my daily commute.
Not bad at all.
Michael