I'm with you Gary, i'm not specifically interested in better MPG (a couple of enthusiastic bursts in the SC on an otherwise sedate drive makes it pretty irrelevant!), but I am interested in the motor running well, especially the SC as the forced induction (more air) magnifies the differences in fuel quality.

Have a look here http://www.thorneymotorsport.co.uk/tuning/...ting.shtml for some independent testing that puts some substance in the debate. There's several other historical fuel tests in the 'Services' section, with a similar theme. 2006 Supercharged
1990 Porsche 928 GT