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Automakers get extra CAFE credits for making them (so they can actually fall short of the standards). But the fuel just isn't available widely enough. And I think the CAFE credit is getting phased out at some point.
I was under the impression that a tax credit already existed. Or maybe it expired. At any rate, there are a bunch of bills to require more FFVs in the future (most recently reintroduced in the Senate by Lieberman and Roberts and in the House by Engel and Kingston)