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Wow, there are alot of opinoins. Since everyone else is sharing there's here goes mine. If your not pinging your ok, and just run the recommended octane. If you have raised your cr, as I have slightly go ahead and run a better grade. I choose to run 89. I think that the temp/ping thing is a little mixed up though. For example, my 2000 chevy truck never pings under it's own load. But If I really load it down in 100 degree weather, and try to pull a hill, it will ping on cheap gas, and loses major power. I think the extra heat may encourage pinging, as will increased loads. WHen I run the good gas in it makes more power when towing, and doesn't ping. Now before anyone says my knock sensor is bad, I already replaced it!
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