Just pitching in here - my 230 bhp 2016 Gti, which I drive with relish when I need to overtake, but otherwise stick to 55-60 on the local lanes and 55 on the M6 each morning because of the 50mph roadworks, is averaging about 42. It hasn't especially been affected by the freezing weather the last few days, indeed rain and standing water seems to affect the mpg more.
Today I got 480 miles to a full tank from full to empty, filling up with 52 litres.
I certainly don't hang about, and it is very very impressive mpg.
My journey to work is 40 miles, mixed lanes and 50 mph motorways.