2011, 2.0 Hdi AM6 - now at 70,100 miles
Having just spent the last 5 days traveling down the UK and into Belgium and back. Mostly motorway above 65 mph(when I could) 48.6 Mpg, average speed was actually 46 mph, which I think this Very good, even my old 'chipped' mark 1 C5 would have found that hard to beat!! Part of the journey (hour + each way ), there and back was spent in horrendous stop/start traffic and personally you can not beat an Auto............(also regularly, 13 mile trip each way to work I get 40 Mpg.).