Create a carbon use tax instead. We need to encourage a retreat from fossil fuels. A purely gas tax allows coal users to pollute. And yes—a know that gas taxes usually support highway maintenance. I am suggesting that we consider gas as just a special case of all fossil fuels. That will allow you to tax the vehicles that now run on methane. A carbon use tax would be passed on to electric car owners who would not be hit by a gas tax. You need to think of the future !