When it comes to regular, midgrade, and premium gasoline, oil corporations have worked overtime to drill the “good, better, best” concept into our collective driver psyche.
Premium gas has a higher octane rating, usually 91 or above, making it more resistant to preignition, a condition in which fuel burns uncontrollably in the engine. Higher-performing engines are the most susceptible to preignition because they tend to run hotter, which is why premium is often recommended or required for sports and luxury vehicles
Source: Yahoo Autos
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