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I'm not going to bother to dignify "50 miles per gallon on a diesel cycle engine" with a response. If you want to know why that's incredibly unlikely, read Chapter 9, Section 3 of Fundamentals of Engineering Thermodynamics , by Moran and Shapiro. An excellent read under any circumstances.
Beyond that, here's how a power cycle works in a furnace, as opposed to an engine. It goes by the general relationship of E = h(Th^4 - Tc^4). h is a constant, don't worry about it. In our case, Tc = 298K, which is pretty much what the outside temperature is on any given day. Th is what temperature our fuel combusts up to. For biologic agents, that's in the neighborhood of 1200K. For natural gas, it can be as high as 2300K, although more typically is 1800-1900K. And once you ^4 those numbers, natural gas wins by 13.5 times greater at best, 5.1 times greater at worst. Good luck getting someone to take that losing bet.
That's not even factoring in fouling and carbon based pollutants that biologic-based fuels produce, nor relative costs of producing combustion suitable "biodiesel" over natural gas.
And if that's not persuasive enough, consider that nobody important in the engineering or scientific communities take this seriously. And remember, take your tin foil hat off before doing so.
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