Quote:
Originally Posted by BDKane01
My '16 BRZ limited has the engine chipping as of 3600 miles. I had always filled it up with Shell 93 octane fuel. Particularly in the AM in my commute they get louder on 93. I fill up at the same 1 of 3 gas stations every week.
I filled up on 90 octane ethanol free fuel yesterday at a Mallard station. So far the crickets are nearly non existent on that gas. I am unsure of the performance between them or MPG.
I'm not really noticing difference at all. Is there supposed to be a performance change in between the fuels?
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There will be a drop in performance since the ECU will pull timing to prevent knock. It will however be gradual not instant so you may never even notice the drop.
Not sure how big an issue running 90 would be but the minimum requirement according to the manual is 91.