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So here is my situation. I have always used 87octane (the cheapest) gas in my cars (with the exception of my 04 Subaru WRX which calls for 91 to prevent pre-ignition in it's high compression motor). When I bought my CBR250R my dealer says to me "By the way... I would recommend putting nothing less than 89octane in this bike"... so I asked "why, is the compression so high that it will knock?" and he said "no, nothing to do with that.... 87 gas is unregulated".... i asked him to explain and he said "89 is where the oil company starts to regulate gas.... in other words 87 gas might be anywhere from 84-7 octane.... 89 is guaranteed to be 89". This sounds like complete BS but he has been a mechanic for 20+ years! Anyone have any SOLID documentation, links, ect to either disprove this or support it
Just don't wanna waste money on 89 gas if it's no better
BTW... i already know that higher octane is to prevent engine knock/ping/pre-fire on high compression motors so lets not drift into that topic please. The subject is quality of the gas


BTW... i already know that higher octane is to prevent engine knock/ping/pre-fire on high compression motors so lets not drift into that topic please. The subject is quality of the gas
