U.S. governors are trying to increase revenues to help pay for infrastructure repairs as they find their main revenue sources aren't enough. Under consideration are gasoline and state sales tax increases and a mileage-based fee for drivers. In Pennsylvania, for instance, Gov. Tom Corbett proposed a plan to raise about $5.4 billion within five years by raising the tax that wholesale gasoline dealers pay. "Governors are struggling all across the country with transportation," said Joe Henchman of the Tax Foundation.