Washington Examiner 
Jan 15, 2013
An on-again, off-again move by the Obama administration to scrap the federal gas tax in favor of a pay-per-mile fee would boost the tab to Americans as high as 250 percent, raising their current tax of 18.4 cents a gallon to as high as 46 cents, according to a new government study.
But without a tax increase, said the Government Accountability Office  study, the government’s highway fund is going to go dry. One reason the fund is going broke: President Obama’s push for fuel efficient cars has resulted in better mileage, and fewer stops at the pump.
The GAO study is just the latest review of federal spending that paints a grim picture of the nation’s infrastructure. Just keeping spending at current levels, the GAO said, would require a near doubling of the gas tax to 32 cents a gallon, and that would jump to as high as 46 cents should the federal government add spending to fix crumbling infrastructure and build new roads.