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lower octane fuel actually gives off slightly more energy (heat) when burned compared to high octane fuel. However, higher octane fuel allows you to run a higher compression, which allows to engine to run at a higher efficiency, that is extract more heat, and convert it to mechanical energy, and therefore produce more power to the wheels.
Basically, you want to run the lowest octane you can run safely. You make the most power, and it costs the least.
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"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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