There are a variety of methods on the table, including directing those gasahol taxes into the Highway Trust Fund, letting the Highway Trust Fund accrue interest and increasing taxes on fuels.
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Starting in 2002, receipts from user fees began to drop significantly, thanks largely to the impact of a slower economy and increased sales of gasahol, an Ethanol-based fuel that isn't taxed for the Highway Trust Fund and is heavily subsidized--thanks to the farm lobby and the efforts of Archer Daniels Midland (nyse: ADM - news - people ).