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"The owner's manual tell you to use higher grade gasoline, but we have been using 87 octane in our gas-guzzling 2006 g35 for 2 years. Our miles per gallon is about the same as with premium, but the cost per mile is significantly less. We do get better fuel economy with 91 or 93 octane on the highway."
The above is a typical scenario; however, when running a higher octane gasoline,what you're really paying for is engine protection. Octane in fuel is something that prevents the fuel from pre-igniting so that the engine runs properly. In the 4 stroke combustion process there is the intake , compression, power, and exhaust strokes. During the compression stroke and air fuel mixture is compressed before a spark plug ignites the mixture to produce the power stroke. If the fuel is of too low an octane rating for the compression in the cylinder, then it may pre-ignite, and cause engine pinging which when constant, can severely damage an engine.
The G35 is equipped with a knock sensor to detect this phenomenon. When the sensor picks up engine knock/pinging, it retards the timing, which allows for less compression by having the spark set-off the air fuel mixture sooner. As a result, you get less power from the same fuel.
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∙ 15y ago
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