So I actually decided to not use cruise control and see how far I could get the fuel to stretch while driving from London - Nottingham the other day. Obviously I wasn't cruising at my usual 80-90mph to get this figure. 52.5mpg was the best I reached (didn't get the photo though). 120,000Miles on the clock (around 90% motorway miles), 58 plate. Still impressed with this thing for it's age, weight and being a V6 Diesel that could pull a train if it wanted to. And before i'm shot down, yes I know the display isn't accurate, but it's still close enough.