Since there are lots of knowledgeable folks on this thread.. I've got a related question about 91 vs 93 octane. In CA only 91 is available except for a very few places. I've considered adding about 3 gallons of 100 octane to the 10 gallons of 91 in the tank. This would bring up the avg to 93 or so.
Any benefit to this?
Since it would be mixed going forward, I'd just periodically add some more 100 when I pass that gas station. If it's not done right I could see the octane rating going well above 93 (and also wasting money on too much 100) ..
I'm not as concerned with performance as avoiding any kind of knock and forcing the ECU to relearn the 91/'low octane' thats being used on a regular basis.
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