going down hill with following wind, with foot off the gas? 
Nope 100% genuinely driving along in the heat no wind, foot holding it at that speed and on a level bit of road, chuffed I was 
I got 49.5mpg average over 700 miles from my BMW 
Seriously though sounds good, what did it average over the tank?
38.6 MPG, 60% motorway, 40% town driving, that was also chasing an Audi A6 3.2 Quattro up to 135 MPH yesterday of course we went to the Autobahns though he let off first though whimp saying that mind gets scary at those speeds but car felt very stable and plenty left wouldn't have gone any further though even though the motorway was clear. Also a Supercharged Range Rover Sport was sticking to my backside yesterday so showed him a bit of exhaust note. Not with a light foot around the town either, that's why I was so shocked, obviously it's been driven sensibly too, but all the racing around made it seem all the better.