Quote:
Originally Posted by lt4camaro
Premium fuel will ward off spark knock, knock sensor retards timing when it detects spark knock
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I'm aware. But if you've been running 87 the whole time before, the ECU is already on a map retarding the timing to remove the knock. Adding premium fuel won't suddenly add more timing and power, it takes many drive cycles for this to happen. You need to run 91-93 fuel consistently to get the added benefits of it. Going back and forth is just wasting your money.