Monthly Archives: December 2020

Proper Grade of Gas: Standard, Super, Plus or Premium

Proper Grade of Gas: Standard, Super, Plus or Premium

There are a lot of misconceptions about fuel grades – and by fuel grades I mean the octane rating. With names like “Standard," “Super," “Plus," and “Premium,” it’s no wonder that people associate the octane rating/grade with quality. Octane ratings are expressed as a number that typically ranges from 87 to 91 at the pump. The number does not mean “better” but rather signifies the appropriateness of a particular grade of fuel for a particular engine. Octane is a measure of gasoline’s ability to resist igniting before the spark plug goes off. Gasoline and air are compressed in the engine’s combustion chamber. When the pressure reaches a certain point, the gas will spontaneously combust. You don’t want that to happen; you want the spark plug to ignite the fuel at precisely the right time. When the gas combusts prematurely, the piston will try to go down while it is still being pushed up by the crank sh ... read more

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