I Drove Back

The skinny gas station attendant is filling Carl and Suzy's car with
natural gas. Like virtually every other auto engine in Brazil, their
car runs on both gasoline and ethanol (produced very efficiently and
sustainably from sugar cane--makes corn based ethonol look stupid).
Just drive up to the gas station and put in whatever ia cheaper Carl
and Suzy added the LNG option because it's even cheaper still.

I drove home, 4 hours?, out of the mountains and into São Paulo. An
adventure by itself!