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Ethanol is a dead end in the USA. We already dedicate 45% of our corn crop to making ethanol and that gets us to a 15% mix in our gasoline. Even if we used the 45% of corn we mostly waste in livestock feed we would only be up to 30% ethanol.
Natural gas was supposed to be the new green fuel 2 decades ago. Cheap, plentiful in the USA, and lower emissions than gas or diesel. It never got to more than a niche slice of the market even with national natural gas pipelines and NG in most homes and businesses. The problem was cost. Tens of thousands extra for the truck plus hundreds of thousands for fueling stations. Then their is the problem of tanks. To get enough range you need LNG or very high pressure CNG. DOT requires regular inspection of those tanks and they have a set end of life date stamped on them. (I forget the exact number of years - it is between 10 and 15)
Then there is the simple fact that NG still has both GHG and local emissions. If the goal is zero emission than NG is off the table. Maybe the goals change but today the only portable fuel that is also potentially emission free is hydrogen
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