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No, the oil companies engineers would agree with that recommendation. For a couple of other reasons as well. Higher deposition rate,lower power, and decreased fuel economy for a few. Believe it or not, an engine like the N's will produce less power and burn more fuel on high octane gas then they will on low octane gas. Has to do with the rate of burn. High octane fuel is a slower burning, less volatile fuel. Think of it as being closer to diesel fuel or kerosene. It's designed to work in very high compression engines and not ignite prematurely. So in a low rpm low compression engine the high octane fuel burns too slowly. It ends up burning in the exhaust manifold, and not in the combustion chamber. So its energy goes out the tail pipe, and doesn't push the piston hard. That's a power loss, and you the operator have to compensate by opening the throttle more and burning more fuel. Low octane fuel is more volatile and burns faster. That's why it pings so badly in high compression engines. Now put it in a low compression low rpm engine and it burns completely in the combustion chamber, and pushes the piston very hard. Harder then the high octane fuel can push in the same low compression low rpm engine. So you end up getting more power and better economy out of the low octane fuel. Hence the recommendation from fuel engineers to us the lowest octane fuel possible to do the job. Not the highest, that recommendation comes from the advertising and marketing weenies. And, since the high test isn't burning well in the combustion chamber, it's leaving deposits in it. Deposits that don't happen with low octane fuel that burns completely (or more completely) in the combustion chamber. Strange sounding, but quite true.
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