gtk: You're wrong.
"The Seattle Department of Transportation's 2009 annual report breaks down the agency's $340.8 million budget by funding source. The gas tax accounts for $13.4 million, or 4 percent of that total. The full budget breakdown (in millions):
Grants & Other: $96.9 (29 percent)
Debt: $77.4 (23 percent)
Bridging the Gap (a property-tax levy passed by voters in 2007): $60.9 (18 percent)
General Fund: $42.3 (12 percent)
Reimbursables: $42 (12 percent)
Gas Tax: $13.4 (4 percent)
Cumulative Reserve Fund: $7.6 (2 percent)
"U.S. PIRG cites the Pew Charitable Trusts’ SubsidyScope project, which found that “user fees paid for only 51 percent of highway costs, down 10 percent over the course of a single decade.”
Even if gas taxes were the direct user payment they’re made out to be, no one seems to have much appetite for making sure they actually pay for the infrastructure needs in this country. Gas taxes haven’t risen to accommodate more fuel efficient cars or even for plain old inflation. Nor have they compensated for the fact that driving is declining, meaning less gas consumption (but, puzzlingly, not less road-building)."