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My Maxima prefers 91 as well, but after replacing the knock sensor I can run 87 alright.
If the car mfg says to run 87, run 87. It's the most bang for your buck (no pun intended) since 87 combusts at a lower temperature than higher octane. In elevations above 5000 feet, you replace the 87 octane with 85 to get the same results.
With the Infiniti, I suspect the combination of a heavy load with incorrect fuel and higher temps caused the engine to have a helluva time retarding the ignition enough to compensate for the lower octane, resulting in the car retarding ignition way too much to get the necessary power. Good thing you didn't burn a hole in a piston, which has been known to happen with bad enough octane knock.
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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