Another one for better miles to gallon using total excellium, avg around 340 on normal unleaded 390 to 400 on the good stuff. only costs about £3 extra each tank too.

On a recent trip to cornwall i avg 44 down there, 28 whilst down there (they do have some awsome roads!!!) and 41 on the way back up.......but thats cos its all uphill back up the motorways right

I noticed Total SUL gave a good return, the nearest total is a fair trek for me and it's a tad exspensive in that station