Hi Folks Car is a 2013 A4 Avant TDI 170 manual Quattro, black edition, 9,000 miles on the clock. I just did a 750 miles round trip, all motorway or duel carriage way driving. I was on the M6 with low traffic so a constant speed, wasn't driving like a numpty etc. Cruise control set to 70mph with two adults in the car. I only averaged 43 mpg which I was surprised at. What should I expect MPG for motorway cruising, I was expecting much higher.