Hiya,
just started a new job that involves a 54 mile commute covbering the M55, M6, M61 and M60 every day, its a joy!! As I start at 7am its not too bad to be honest.
Anyway, tried the journey on Optimax and got 39 - 40 mpg, same journey on cooking unleaded and got 36 mpg!!
The maths gives...