Went to Wales the weekend got 48mpg at 68mpg and with the runs through the blacks & Brecons avg 33mpg
40mpg+ on mine with Cruise set to 80 and AC on on Tuesday on my way down to Dover. Its not at 9 though after making it to Belgium/Germany
Im getting around 28 mpg from mine (that's 95% motorway) and get between 300 to 350 miles from a full tank. Could be better if I drove with a lighter right foot but that's not the reason I bought a RS.
Yeah I get 27 mpg average which is a lot of short trips and the occasional longer one. I can easily see 35mpg on a motorway trip though.