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I must admit I almost converted an old Mercedes convertible I owned to run on propane. Still fossil fuel, I know, but much cleaner and half the CO2 of gasoline...
Concerning large trucks and other burners of diesel fuel: as a friend of mine who has a diesel pickup notes, gas came back down, but diesel didn't, and not for the first time. Simple economics is going to force the change to an economy built around just-in-time supplies of things brought in via over-the-road trucking, not to mention oceanic shipping.
When shipping costs obliterate profits, that model falls apart.
