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zman -
For my 1999 Saturn S-Series, the upper limit seems to be 179 degrees F. This was documented by lovemysan. I think the hottest I have ever been is 166 degrees F. I like it below 150 degrees F so that I don't have to think about it.
Currently I am running with 91 octane to avoid the risk of ping/knock. However, when I ran 87 octane during the height of the gas prices, I never noticed any problems. However, my HAI configuration was probably topping out at 135 degrees F at that time.
CarloSW2
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