So, I live in Hampshire, and I'm originally from central Scotland Tonight I'm driving the 398 miles back home for a long weekend. Scenario is Cls 3.0 v6 DIESEL just me ( no kids or wife or their accoutrements) One bag (not the mother in law) Route is Basingstoke to Newbury A339 Onto A34 M40 M42 M6 M74 Glasgow a/b roads Home. I tend to sit between 75/80ish I also don't do any stops. Can you guess my mpg???