I used to have a cool can for my fuel when I used to race cars. The way it worked is you packed more fuel in, and even at less efficiency you'd make more power. Lets say you spray 10g of fuel in a cylinder at 60deg and it'll make 2.5 hp ( about 25% efficiency), so you deg temp to 20deg and now you able to pack 20g of fuel in that same cylinder and you're making 4 hp ( efficiency dropped to 20%) but you gained power even though you're using twice as much fuel.
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