@freakazoid Deisel fuel itself has a slightly higher energy content than petrol/gasoline, the engines run at higher compression ratios, and at higher temperatures (Carnot efficiency), all of which net more mileage and lower CO2 emissions.
Emissions of *particulates* (especially PM2.5, v. bad for lungs and health), and of NOx (nitrogen oxidising at high temps and pressures) are *worse* for deisel than petrol engines.
Also possibly sulfer and other sour crude contaminants.
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