Should Drivers be Charged for Every Mile Driven?

Fuel efficient cars may be the way of the future. But more fuel efficient cars means less gas is pumped, and in turn — less revenues from the gas tax. This will mean states will have even less cash on hand to repair roads and bridges. As a solution, Oregon is moving forward on plan it's been talking about for years -- a new tax based on the number of miles driven rather than a tax on fuel.