I was on the 401. Going with the flow of traffic, safely. Also back roads within the margin of an 80km road...
No cylinder deactivation, 8 speed ZF, 91 Shell premium fuel and a really good tune for my 620hp. It basically idles at 130...I mean 100.
I was flabbergasted too, but doing my calculations, it really did get that mileage. I usually average about 11-13 in my around town driving.