Quote Originally Posted by Dek Hawkins View Post
I have a 2500 HD DMAX, 2002, ... it does 27mpg on a 100 mile motorway trip @ 70-80mph,
Given how far from 'typical' that number is, may I ask if that was a single 100 mile trip and tank top-up when you got there? I guess what I'm saying is that the top-up may have shut off very early and given a false economy?

or maybe a 100 mile long downhill stretch? :-)

(yes I know imperial vs US gallon, still 24+ in our context)