From your link, and at the very end of the article:
Walker said (in 2006), “It is clear to me that a big government mandate is not the way to support the farmers of this state. ... The free enterprise system must drive innovation to relieve our dependence on foreign oil, not mandates from the state or federal government.”
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Nine years later, on March 7, 2015, Walker reiterated his earlier position:
“While I do not support the mandate, I do not have a problem with ethanol...”
“However, it is clear to me that a big government mandate is not the way to support the farmers of this state...”
“Central planning will not help our family farmers, protect our environment, or provide jobs.”
“The free enterprise system must drive innovation to relieve our dependence on foreign oil, not mandates from the state or federal government.”
Blah, blah, blah. The point is that he won’t identify a time to phase it out. His rhetoric doesn’t match his stated plans and actions. He’s an ethanol sellout for the Iowa vote.