Would you use yeast to make it, just like homebrew bootleggers? How much would that cost? The hydrogen approach would be really expensive....

Recumbant trike = $2,500 U.S.
Natural gas/hydrogen engine = $1,000 U.S.
All-weather canopy = $500
Home hydrogen or natural gas refueling appliance = $3000 U.S.
Solar modules = $10,000 U.S.
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Total = $17,000 U.S.

You might have an extraordinarily good idea with the alcohol thing! Ironically, people who make their own beer might be the only people still driving their cars if there is a fuel shortage! LOL. But you need sugar for the yeast to make alcohol? Sugar comes from plants, and photosynthesis is really inefficient, much less than 1% conversion of sunlight to chemical energy. Alcohol might be easier to make and store, but I don't think it could be made in sufficient quantities to be used en-mass. In contrast solar photovoltaic modules routinely get up to 10-12% efficiency, and operate for 20 years. The initial outlay is high, but would amount to $500 per year for hydrogen for your recumbant vehicle. For comparison the Volkswagon Jetta Wagon Diesel would cost you about the same for fuel annually, between $400-$500 per year.

I might try both if I can come up with the cash. The neat thing about the recombant trike is its versatility as a testbed for different engines and fuels. Meanwhile the Big-3 automakes make multi-million-dollar prototypes that look like this:

And there is no way you could reduce fuel consumption to renewable levels with a car that size. There is quite a difference in size/mass/speed with the recumbant: