There's a difference between hybrids and electrics here. Hybrids are more efficient, but a lot of them are not terribly so compared to the most efficient non-hybrids; there, the issue is the general efficiency drive and the potential dent that the new CAFE standards have to run up MPG ratings across the board. Electrics, on the other hand, definitely need a separate tax basis since the use there is zero (or very close to it; I suspect you're going to see more dual mode electrics than pure electrics in the medium run, since absent widespread catenary setups, electrics tend to have the problem of definite trip limits and long recharging times).I don't like the idea of GPS tracking devices. The government doesn't need to know where I've been, and I can just imagine the infrastructure involved in actually keeping track of millions of vehicles. Nothing's wrong with just reporting the odometer reading.
As more and more vehicles are going hybrid and electric, we're going to have to do something. I don't think it's fair that electric aren't paying a dime in taxes, yet they still enjoy driving the roads. I'm just guessing, but I've heard within 5 or 10 years, half of vehicles on the road today, will be either hybrid or electric, and the gas tax situation will be worse.
Honestly, I'd go at it from a few angles:
-Allow tolls on interstates, within set limits (to avoid them being used as a cash cow...Delaware, I'm looking at you).
-Stick with the gas tax for either straight gas/diesel vehicles or for "normal" hybrids.
-Use a mileage tax on electrics (or vehicles that are primarily electrics).
One thing I see as an issue, by the way, is that if you go to a mileage tax, there is going to be a big push to axe any and all fuel taxes.
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