Quote:
Originally Posted by psalt
Once the fuel spec drop occured, the 70's and 80's models were detuned timing wise. If you have higher octane fuel, these models respond to advanced timing. Once the emission strategy advanced to the feedback converter, the factory increased compression to improve both output and efficiency. Even when the fuel spec rose, they chose to keep raising compression rather than timing to post better consumption figures.
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I overlooked this part of your post. I agree