Quote Originally Posted by blutopless2 View Post
Couldn't believe it was so much more than 98 octane for the small increase in octane rating.
Especially when ethanol is supposed to be cheap(er) than petrol hence ethanol fuel is usually cheaper.

From what I have read/heard, fuel has a "power" factor, yes more octance is a good thing, but ethanol has less "power" than normal fuel so at a higher octane things start to even out. So 100 RON including 5% ethanol may be the equivalent of 98 RON straight petrol??

From what I understand it's like LPG, which has a high RON number 100 - 110?? But has less "power" than regular petrol. So you use more, has less (or the same) power, but it's supposed to be cheaper (or greener/cleaner) to make it worthwhile.

Anyone know more than me?