they come up with garbage plans all the time, and just like this, they usually get shot down.

The idea also is gaining ground in several states. The governor of Idaho is talking about such a program. A North Carolina panel suggested in December the state start charging motorists a quarter-cent for every mile as a substitute for the gas tax. Rhode Island's governor, however, has expressed opposition to a panel's recommendation in December that the state charge motorists a half-cent for every mile driven in addition to the gas tax.
actually doesn't sound that bad, as gas taxes are very high, but adding them on top wouldn't work at all.

and air can't be measured in kilowatts...