I drove to Portsmouth and back (450 miles) & scraped 42mpg, that was properly trying with 0% driving enjoyment. It was pointless other than to report back the MPG figure
Best every in my GTI.
I never saw 400 miles to a tank, probably just under on the best ever. Usually, 300 was realistic.
I used to average 32mpg per tanks usually, 27mpg around town.
Now in my TDI A3 Black Edition CR170, if I batter it and try for low MPG, I can't get below those kinna figures
It did 27.2mpg over half a tank on the first track day I ever did