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Message: <blockquote data-quote="glock_8" data-source="post: 396842" data-attributes="member: 14626">:106:i never go through this subject in depth....but from simple understanding..higher the octane rating...more difficult to combust...suitable for high compression engine since the fuel will not combust prematurely....when the factory specified thier optimum power derived from ron 98 to yield 218hp then i reckon any ron lower than that would render changes to the engine timing to replicate a lower compression engine to avoid pre mature combustion...so the lower the compression (for na) the less power it produces..its no doubt the car can still run...but not at the rated power anymore.as for turbocharged engine, it will have lower compression ratio since it is a force fed. if you tweak the boost (more than the standard manufacturer tune) then u have to lower the compression by changing to thick metal gasket etc.am i right or just confused</blockquote>