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Originally Posted by Dean
OK, this is a gross oversimplification/generalization, but...
Typicaly, you want to run the lowest octane you can that allows the most timing advance without detonation.
On a low compression NA engine, especially at altitude, this is most often 87.
If your owners manual says to use 87, using 91 is most likely to deminish performance.
Octane is basically, the amount of fire retardent in the gas. And you want the minimum amount possible to eliminate knocking.
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That explanation helps.
Owner's manual says to use at least 89.
I put 89 in it this afternoon, and I can't really tell the difference, so I must have imagined the difference that 91 seemed to make.
Another positive - gas went down another $0.05 today!