That's why they will eventually outlaw the production of "home fuels" or require a "permit" in which they decide how high the permit costs will be, the regulations, the distribution, etc,etc,etc...
It'll go on and on until they have at least 50% piece of the pie. Count on it.
Well, like I said, they won't have to do that...they'll just shift the tax to a per-mile tax, and force you to have a GPS unit on your vehicle.