Cheers, so how did i do it......I will start by saying my long term average is 47.9 after 4500miles, screen shot below from my Android milage app

The 71.7mpg today was done in Normal with AC on light, outside it was 19-20 degrees, I'm running on Tesco fuel and started from Basingstoke up the M3 to just passed Staines on the M25 where i hit traffic. I was driving with the ACC set at 52mph (50mph on satnav).
Now i have a full sized wheel back (bye bye space saver, hope i never see you again) normal service will resume,
this sort of MPG is achievable on the right roads, if you have the time and patience etc...