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Post Script, I did learn about octane ratings here, so thats a good thing. My questions back to ya would be what about carbon deposits? My understanding is that the high grade fuels succumb to higher refinement processes are therefore cleaner burning and typically leave less carbon residue. Is this folly?



Folly is not the right word. Bullsh!t is much more accurate.

First of all, it's not a higher "grade" fuel. That's marketing bullsh!t. It comes from the same tap at the refinery. The octane rating is achieved by adding chemicals to increase the (say it with me) re-sis-tance to ig-ni-tion.

In fact, using a fuel with too high an octane rating can cause incomplete combustion and thus increase carbon deposits.
That probably would not be the case betwwen using 91 as opposed to 89 rated fuel, but if you moved to the racing fuels, your bike would run like sh!t.

Bottom line, you will get the best performance using the lowest octane rating that does not cause pinging.

Contra todo mal, mezcal; contra todo bien, también