I would debate volumetric efficiency as the reason diesels are more efficient. Turbo diesels and new diesels with egr leave more unburned exhaust in the combustion chamber. We are talking part throttle economy here. You are talking economy at 85+% load. Of course at full load the expansion ratio. It is the expansion ratio, not the compression ratio that contributes to higher efficiency b.t.w. And yes the higher btu's per lb of fuel and the unrestricted intake tract. But again...........we are talking part load efficiency here. Take a look at any 100HP diesel on the Nebraska tests and load it to only 25-50HP. The fuel efficiency will be worse than a decent 50HP gasser in the same application.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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