I usually drive a 400mile round trip every other week, mostly on Mways and DC ways. Normally driving after a night shift (2000-0100) and I have always just driven at 60mph on single carriageways when possibe and then 80 on dual carriageways, roughly averaged 52-54 (although 50ish recently with cool weather).
Last night I was in a rush to deliver a valentine gift before midnight

so was driving at 90mph no more on the Mways etc, and was expecting dreadful MPG, still managed 47mpg!!

This pleases me, don't know about you lot. Just thought I'd share
