Originally Posted by Rollo
98RON petrol contains 39.5MJ/L whereas diesel fuel contains 38.6MJ/L. Theoretically if you could use a Diesel cycle to extract more energy out of the same fuel as a regular Otto cycle then it would make sense.
Since the Diesel cycle uses compression ignition as opposed to spark ignition in an Otto cycle engine, and the real differences are the pressures required inside the engine, I don't think it would that much of a leap to attempt it. Isn't that what you pay engineers to test for you, to push the barriers?
Certainly stopping less in a GP might be worth the effort.