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Here's the deal : higher octane means less volatility, and this is meant for engines with higher compression so that the fuel doesn't ignite too early in the cycle . Lower octane fuel is more volatile and is meant for engines where compression rates are lower, so that the ignition in the cycle not occur too early . In all cases, follow the manufacturer's ...


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Generally, you're best off using the fuel recommended by the manufacturer. Octane rating is a measure of how resistant the fuel is to ignition. The higher the octane, the harder the fuel is to ignite. Fuel that is harder to ignite allows higher compression ratios and more agressive engine tuning. If the fuel is too low octane, modern engines will detune ...



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