Ethanol is a bad choice though. It's expensive to make, and it requires growing an insane amount of corn or other crop on what normally would be food crop land in order to burn it as fuel, and it takes more energy to make it than you get back from it. Does it really make sense to burn your food in your auto? It's no answer to oil. It's like using a band-aid to patch a sucking chest wound if you ask me.
The cleanest option would be to have 100% electric vehicles, and recharge them from power grid, and that would only really be clean if you used fusion reactors, which nobody seems to be able to get working just yet. Right now there is a process that exists to turn biological waste into a synthetic light sweet crude that could be refined easily into diesel or gasoline or any other fuel, along with most useful petroleum products used in manufacturing. This technology has been around for close to 20 years, yet why is it not being pursued or discussed? It would solve a few problems - reducing the amount of waste going into landfills (recycling, anyone?), cheaper renewable fuel, create jobs, and reduce dependence on foreign oil suppliers that use the market as political leverage. Easier for the politicians to just subsidize corn than to do real R&D I guess.
I can't say about metrics, except that both systems are used and intermingled. They sell more tools that way. I blame capitalism!
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