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three things to keep in mind
1. Pg 421 refers to the general notion that putting lower octane gas into any car designed for high octane is bad. The key word here is "can" and in real world means if you put 87 or something then you will most likely get pinging under load. This is a catch all warning, it is simply the physics of the process.
2. Modern engines have their fuel/spark electroncially controlled. The car will adjsut to lower octane. You'll lose a few horsepower and the car may ride a little rougher.. but..
3. in the case of 91 vs 93, the difference is arguably minimal, furthermore one has to keep in mind whether the 93 is true or just a 91 with ethanol additive. I put shell 91 into my car and have had no problems.
the whole ethanol vs gas is a seperate discussion.
FILL AWAY AND DON'T FRAY (or whatever)
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don't you think if I was wrong, I'd know it?
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