http://www.freerepublic.com/focus/f-news/1576912/posts
AND HERE
[snip]
"You have to have a revenue-collection system in place to respond to that," says James Whitty, manager of the office of innovative partnerships and alternative funding for the Oregon Department of Transportation.
Whitty and others propose taxing you on how far you drive, not how much gas you use. There are other approaches being considered to supplement the gas tax in years to come, but the so-called mileage tax is gaining attention as the replacement that many say will eventually be needed.
Whitty believes that most cars eventually could be outfitted with a global positioning device and computer to determine miles traveled in a given state - information that would be used to determine the tax bill.
Rest of the story...HERE
It's the wave of the future.
How will this "bill" be paid? Right now, gas taxes are rolled into the total price of gas, so it really doesn't hit you in the face how much you're paying in tax. On the other hand, a bill in the mail or a fee tacked on somewhere where it can be calculated will be much more noticeable.