A 75 mpg car

Runs on butanol. Dow chemical is pushing the idea (of course they make butanol). But it’s not far fetched. Compressed natural gas is another similar, high mileage, low pollution fuel source. Asian car and truck makers such as Isuzu already make CNG vehicles for India and China. And ROUSH has a Liquid Propane Injected conversion kit for Ford F-150s that installs in eight hours.