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Brian hit all the high points

HP is a mathematical figure based off of torque and RPM. So if you compared a gas burner to an oil burner at the same RPM, the typical torque figures will be significantly higher on the diesel. The BSFC is also much lower. (Brake Specific Fuel Consumption.) Diesels will only burn enough fuel to get the work done, no more. A gas engine has to have the same air/fuel ration over the entire load/rpm spectrum. The air/fuel ratio on a gas engine is around 14.7-1 while a typical diesel can be as low as 100-1 at idle and as high as 30-1 at full load.:hi:
 
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