Quote:
Originally Posted by hansenp
Put in 87. From costco last week all was fine Went to a local station today and it started to knock when coming up my steep driveway. Can I get by with 89?
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If you put low octane gas in an SS, the ECM starts pulling timing/mixtures and other data I'm not smart on from the "low octane" tables. This definately affects engine performance. Check the fuse pull thread on the V8 engine discussion.