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Different cars require different types of gasoline. Most automobiles take regular unleaded fuel, also known as "87 octane." Higher-performance cars typically require fuel with a higher octane rating (at a higher price per gallon). But what does an "octane" mean and what does it matter? We hit the road in search of answers. The always reliable "How Stuff Works" provides a crisp explanation. When a fuel is rated "87 octane," it contains 87% octane and 13% heptane. This ratio signifies "how much the fuel can be compressed before it spontaneously ignites." The higher the
octane, the more compression is possible. Auto manufacturers can boost a car's horsepower by increasing "its compression ratio." But here's the rub. Change an engine's compression ratio and you must use a fuel with a high enough octane to handle it. So if, for example, your car requires 92 octane and you fill 'er up with 87, the engine will "knock" and can become seriously damaged. However, if your car requires only 87 octane, don't bother with a higher-grade gasoline. You won't see any improved performance or mileage. That's the lowdown on octane ratings. If anyone out there feels like explaining "Techron," please drop us a line.
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