>>There are three grades of gas here. It is based on Octane. Regular, a blend of regular and premiun and Premium. The higher the octane, the 'better' the gas is for the engine. eg. less carbon and it ignites better fewer emissions.
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>My understanding is that higher octane doesn't make the gas any better. It's just a matter of what the engine has been tuned for. That is, if your owner's manual says to use regular, you should. Premium only if the manual calls for it.
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>Tamar

I don't know.