Apparently, Oregon actually is a model for the nation in at least one respect:
Delaware, Pennsylvania, Connecticut and New Hampshire are proposing pilots to figure out how they might charge motorists a fee for the miles they travel — rather than taxing their gas, as state and federal officials do today.
Oregon's been doing this for a year or so, collecting cash from volunteer drivers based upon mileage, and there is little question that they'll eventually mandate it, despite the unpopularity of the approach: the state had hoped to coax 5,000 people to volunteer to participate in their pilot program but only ended up with around 800 willing participants, which would seem indicative of a massive fail that can only be "corrected" by a state mandate.
Privacy remains a key issue, including how the government can track miles traveled without raising fears of snooping on where people are going.
This fear is generally raised by people who have no problem with having a smartphone, which tracks considerably more than mere geolocation data. A more pertinent issue would involve government poking their nose into how hard a driver accelerates, sudden stops, and other unsafe driving habits - yet people seem willing to install such tracking devices in their vehicles if they think it'll save them money on car insurance.
Some folks wonder how the government device would be able to determine whether you're driving in another state rather than in, say, Oregon, and the answer to that is fairly simple: the same way your cell phone knows that you're not actually in the 503 area code at the moment.
In a nutshell, the approach treats roads like any other utility: you pay for the amounts of water and electricity that you use, so you do the same for road use. In this case, you don't pay state gas tax; you get a rebate from the state on any state tax paid at the pump. This way, out-of-state drivers still pay the state gas tax when they fill up.
And cell-phone users, rest assured that there'll be a mileage app for your phone.