34k our 1.6 multijet averages 52 though it's just done 3k miles through France and the Alps fully loaded with cycle carrier and 80 mph on autoroutes. Now back to normal duties and it's creeping back up to 54 where it usually sits. This average is currently over 20k miles.
Fair enough, if you know them quite well they might actually tell you how the two versions compare. No skin off their nose as they say