Wonder why ADK's buddy was running so hot on the cooler, slower burning, higher octane fuel. Appears to be directly related to octane rating, but maybe some other factors involved.People with turbos and high boost often use richer mixtures and higher octane to cool things.I use 91 pump gas in both of my sidexsides and the main reason is that the higher octane fuel burns cooler and helps keep engine temps down. Since putting the turbo on the "S" I mix 50/50 110 VP with 91 pump.These two views are completely opposite. I guess I'll have to do some outside research on this. Just interested to know.run 87, my friend used to run 93 in his honda atv and kept overheating halfway through our trips...he tried some crap you put in your antifreeze called ice and it didnt help...I told him to run 87 because the lower octane helps keep the engine cooler...long story short he changed to 87 and never had an overheat issue again...
Wasteful, but it allows higher pressure and more power.
A lean mixture therefore runs hotter in comparison, in hard use or forced induction.
Higher octane fuels as a rule burn slower/longer, and these are nano seconds, which in turn lower octane burns (explodes) all at once, generating more heat per explosion.