Some time ago, Washington State senate passed a bill to tax EV owners $100 per year for road use (best I can tell, it still has to be passed by the House before it can become law). This tax is meant to make up for EV drivers not paying gas taxes. While the concept of EV drivers paying their share for roads is reasonable, and in fact I don't know of any EV drivers who have disagreed in theory, the current proposal is absolutely absurd. As if someone just pulled a random number out of their keester.
At the heart of the problem is the way gas taxes were originally implemented. It was an easy (or shall I say lazy) way to tax people for road use, which can then be used to pay for road maintenance. The problem is, the wrong thing is being taxed. The EV tax problem itself is evidence of this mistake. If you are going to tax based on usage, people should not be taxed by how much _gas_ they use; they should be taxed by how much _road_ they use. How much "road" is used would be some metric factoring in miles driven and possibly how damaging the vehicle is to the roads, which could be roughly estimated using gross vehicle weight. There might also be a few different "classes" to handle certain vehicles differently, such as tractor trailers. (Aside: Some people have advocated using built-in GPSs to track mileage, which is itself bad idea, as it is far more practical and less invasive to just take an odometer reading, which could be part of the registration process.) Such a system could be phased in over a period of time, while phasing out the gas tax (or leave the gas tax in place as well to boost dwindling road maintenance revenue and encourage alternate fuel adoption).
Now lets just say the government doesn't feel like revamping the entire system to something that makes sense. Very well, but in this case you need to apply the same stupid system for EV drivers as you do to all other drivers. Not easy, but it can be done. In a sense, tax them based on electric "gallons" used. The EPA has already developed a standard for how much electricity is considered equivalent to a gallon of gas, and is rating all EVs and plug-in hybrids with this new metric. A good EV rates at around 100 miles per gallon equivalent (mpge). Now lets consider where someone drives 10K miles per year in three seperate scenarios: a 20 MPG classic car, a 50 MPG hybrid, and an EV rated at 100 mpge. How much gas is used in each scenario? 500 gallons, 200 gallons, and 100 gallons respectively. The Washington State fuel tax is a hefty 55.9 cents per gallon (source: en.wikipedia.org/wiki/Fuel_taxes_in_the_United_States). That comes out to taxes of $279.50, $111.80, and $55.90. This is further complicated by plug-in hybrids, as you have to track EV miles separate from gas miles. However, all plug-in hybrids I know of already do this, so it is potentially possible. It would also be a massive pain, which is why it won't happen. But the scenario makes a good case study.
Why is the classic car driver paying 2.5 times more than the hybrid driver for the same miles driven? It doesn't make sense. Even worse, they would be paying 5 times more than the EV driver. But if we are going to have a reasonable system, and you are not willing to change how it works, you have to consider these scenarios as a baseline when determining what to do for EV drivers. So, you want to be as lazy as possible and just charge EV users a flat rate? Where did $100 a year come from? That would be the equivalent of EV drivers driving almost 18K miles per year. How many miles do you think an average EV driver drives per year? Keep in mind that the average EV is limited in range, usually not capable of more than 75 miles before needing a recharge that can take hours.
For the sake of argument, lets say EV drivers really are just going nuts and averaging 18K miles a year, and the $100 flat tax is a valid average. Or go with the argument that you can't use the EPA mpge ratings, and they came up with the number some other "fair" way. What about the classic car vs the hybrid? Why aren't tax advocates outraged by the hybrid drivers not paying their fair share and advocating additional taxes for high mpg cars? Why aren't their opposites outraged by the classic car drivers being over taxed and advocating refunds or reforms for low mpg cars? Why, at a time when alternative fuels are to be encouraged, is anyone making a stab in the dark attack on electric vehicles and only electric vehicles? Of which there are so few on the road currently to make a difference anyway. Is it just ignorance? Or is it nefarious political agenda?