Quote: Just because he agrees with you don't make him right. The BIGGEST reason a diesel is more fuel efficient is because it runs dead lean ALL the time and can do that because it is compression ignited. Pumping loss is absolutely a consideration but most of the loss is from the compression stroke not the intake. A Jake Brake on a diesel is an apt demonstration.
Kevin
You're debating with yourself here, no one is arguing what is the single greatest characteristic which makes a diesel efficient. We were discussing the effects of pumping losses on efficiency, welcome to the discussion....
