i remember that test.

i think you have to use it constantly for ages to notice a difference, unlike some chavs who assume adding a fiver to their tank is going to turn their 1.2 nova into a supra or something

I havent put 95 in my st for about 5 months! i always use ultimate but then im luck enough to be able to get it for 45p per litre.
And ive just done a 250km journey all on autobahn and was sat at abuot 105 mph (170kph) for most of the way. the computer gave me and average speed of 62mph and an mpg of 29.5. not bad for the speed i dont think and with the a/c and bluetooth on too