I think Kyle made an exceedingly good point - the oil industry did not need extremely high subsidies to begin, thrive and dominate. It was in demand. People wanted it. And as the industry advanced, more and more uses came from it. I think a case could be made that today, at least one reason it is subsidized is, it's so very vital to our entire country, we can't permit it to collapse - we don't just need the gas, we need the petroleum products, which can include an overwhelming amount of what we buy - plastics, synthetic fibers, paint, shoes, pesticide, crayons, tires -
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EVs, on the other hand, are not seeing the leaps and bounds WITHOUT help. I mentioned once before - once bicycles became useful for everyday people - not the ridiculous pennyfarthing types but the modern bicycle - there were MILLIONS across the planet within two years. When flight was first achieved - people were flying the English Channel in just nine years and they were dogfighting over Europe in 12.
I realize you are not forcing EVs, but making legislation that says all new vehicles must be electric - that kind of DOES force it.