Quote:
Originally posted by B. Elliott
Running a higher octane gas that what is needed will cause excessive amounts of byproducts ie. carbon, to build up.
Since the compression is higher in mine (10.2:1) i run nothing but premium 93 (92). Coincidentally, just like the factory service manual reccomends.
http://www.sacskyranch.com/deton.htm
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Factory recommendation is in RON, not US AKI. RON 92 = US AKI 87. US is (RON+MON)/2 and is typically equivalent to a Euro rating 5-6 points higher.
I ran 87 octane in my '89 944 NA (10.9:1 CR) and it didn't ping at all. Also did just fine on mileage.