You're correct, but not entirely accurate - higher octane means a slower burn but it does contain more chemical energy, therefore an engine that's set up to take advantage of it will be more powerful than an identical engine tuned to use regular fuel. If you run an engine set up for Super on regular, it will damage it. Just my 2p Martin > >A point that i havent seen or missed is that a higher octance fuel >burns slower than a lower octane fuel. That's the MAIN reason it is >used on high performance cars with higher compression or forced >induction. You get a slower more even and cooler burn which prevents >detonation etc.. >It is a common misconception that a higher octane number means it's >MORE potent. > >Nick 10927 > > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/