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Message: <blockquote data-quote="Realtorbiker" data-source="post: 1599324" data-attributes="member: 301812">Regular. I think you mean premuim or regular.Both octanes are unleaded.Premium is a total waste of money if the engine is designed for Regular gas. Premium has no more power and acutally will get stale quicker. \----Only if one has an engine that the enginiers demand premium then it must be used or todays engines will retard their timing to avoid piston knock and the engine will sludge up. Dont ever think you know more than the men that wrote the manual.</blockquote>