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Pulse and gliding also works in a diesel because efficiency changes with load, but this time due to combustion temps. The hotter the working fluid the more energy can be extracted from it. In an ideal engine you'd use pure oxygen and fuel in the most concentrated form possible (i.e. liquid form for both) and then burn them into a trillion degree ball of molten plasma in a cylinder.
Diesels also run leaner than stoichiometric even at full throttle (unless tuned to roll coal). Yes, you get more suit at higher loads that's partially burned fuel. But all in all you usually get maximum efficiencies at 100% load, unlike a gasoline engine that drops at too high of a load due to fuel enrichment richer than stoichiometric.
Propane or natural gas can help burn up even more fuel so you get less suit, at least in theory.
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