You were doing good until you included that part about "dropping imported ethanol tarriff". The reality is that Brazil only produces 400,000 barrels of ethanol per day and most of that is consumed in that country. The USA consumes 8 million barrels of ethanol per day. Additionally, ethanol only contains 70% of the energy content that gas does. Ethanol simply isn't worth the oil invested to transport here.
Let the Brazillians keep their ethanol...we should be pressing Congress for more access to drilling, more access to oil shale and investment in coal to liquid production.
My point is simply to let the market take care of itself. If ethanol is a ripoff, and it is, it will go away.
Biofuel development and improvement however, should be encouraged through tax credits.