That's a great explanation, Keith, thanks for posting that. It's expanded on my basic understanding that higher RON prevents pre-ignition and thus allows higher compression/more
Couple of questions though:
There's another recent 95 vs 98 RON thread around here where folks are claiming both improved performance and better fuel economy with 98 from TS and Busso V6 engines - so no turbos. I can see the perceived performance gain being a placebo effect possibly, but I assume people's MPG figures don't lie.
I think it was suggested that premium fuel burns hotter, and can clean up carbon deposits in the combustion chamber, and this leads to better mileage. Does that hold any water? If not, could it be due to other differences between normal and premium petrol, besides the octane rating - additives etc.?
Wonder if anybody has dynoed their
Alfa on both 95 and 98 RON, and saw any real difference.