Looks like you were right mate! I managed 64miles to that tenner, although i dont reckon thats too bad, as well as the top end fuel set up, it saw 140ish twice on the way home, the rest was just sat around 90mph.
A tenners deffo goin a lot further, I might be able to cruise to a show or two now and still have enough money left to get in!
Im Gonna do constant mpg as discused in a while, will pm you results, cheers again for your efforts pal