You should take into account seasonal demand changes. Last March the US used 642,688,000 barrels of oil and petroleum products. This March we used 641,559,000. A decline of 0.1% (March is the latest data point) May I suggest U.S. Total Crude Oil and Petroleum Products Product Supplied. Do not look only at Crude Oil, we import gasoline, Kerosene and Distillates as well.
Ethanol doubled last year and is set to double again this year
You are comparing products by percentages when the quantities differ by several orders of magnitude. Try using gallons. With the lower energy level of ethanol, you would be even better off comparing BTU's as it takes more ethanol to move a vehicle the same distance as gasoline.
GM and Ford are both retooling to produce a very different fleet of American cars
Great. More choices can only be better, as long as it is choices and not government forcing different products.
But you still do not address the issue of what it takes to produce ethanol in the quantities you discuss. I do not believe you understand the size of the undertaking you suggest. It is not just a matter of willingness and expense.
You are a just a sophist, and that does not interest me. I am watching, instead of trying to prove I am smarter than everyone in the world. I have fine creditials, and know where I stand.