Ethanol is a widely available fuel, said Sen. Tom Harkin, D-Iowa, unlike so-called "drop-in" oil substitutes, which are still about two decades from reaching the market. "By all means, we should continue apace with the development of drop-in fuels, but this is not an either-or proposition. Until drop-in fuels are commercially viable, we should continue to support ethanol," Harkin told members of the Senate Committee on Energy and Natural Resources.

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