ElI5, does filling up Supreme gas give you more milage then regular and is it significant?
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In most cases, using a higher octane gasoline than your owner’s manual recommends offers absolutely no benefit whatsoever. It won’t make your car perform better, go faster, get better mileage, or run cleaner, and high performance vehicles that require high octane gas will tell you so.
Raising the octane rating (also known as the anti-knock index) doesn’t change the energy content of a gallon of gasoline. A higher octane rating indicates greater resistance to knock, the early combustion of the fuel-air mixture that causes cylinder pressure to spike. When higher-octane fuel is flowing through its injectors, the engine controller can take advantage of the elevated knock threshold and dial in more aggressive timing and higher boost pressures to improve performance.
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