This has something to do with a higher power produced when the air/fuel is compressed in the engine. Diesel fuel is injected into hot, compressed air in the cylinder and spontaneously ignites at a much faster rate than gasoline. More power is produced from this compression rate, resulting in better gas mileage than standard gasoline that uses a spark ignition engine. The result is a bit smellier and dirtier, but cheaper because less fuel is necessary for the same amount of power. To give an idea of the difference in compression rates between the two fuels, today’s gasoline engines have compression ratios of about 10:1 , while diesels can have a rate as high as 25:1. Thats a lot more power generated!
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