Actually, I need to correct my statement, it actually reads, "87 Octane or higher."
The advancements in electronic sensors and control have allowed all the car manufacturers to allow engines to run on regular versus premium fuel. Knock sensors are more finely calibrated, engine control sensors have a better control over the power curve, fuel, timing, etc. Even the Vette I just traded in, could run on 87, the owner's manual just recommended 91.
I know from reading test reports on Cadillacs that have high compression and use 87, there is no noticeable increase in HP and definitely no increase in fuel mileage. I have not seen any studies done on this engine, but I know they have done them.
Since this is a high compression engine, there is no comment about how higher octane should not be used and may cause damage more than benefit the engine. So, it appears you could burn higher octane and not have a problem.
"I was schooled that that was taboo....yet it seems to run fine!"
I was schooled the same way, but things are changing so fast now that it is hard to keep up with the new technology.
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Black Sheep Hummer Squadron
(ME TOO)
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