Several states, most notably Oregon, have run plans like this up the flagpole. On a state level, I see problems with the whole thing from the basic mobility of our population. The thing with gas taxes is that they affect everyone equally, eventually (You may drive into the eastern side of a Left Coast state with gas you didn't pay their taxes on, but you'll probably have to buy gas at their tax rate to leave again) but with the black box, only the people who actually have to live there will be paying. There's also nothing in any of the black box proposals about ending or reducing fuel taxes, so everyone with a regular-fueled ride will be paying twice, so that pretty much forecloses the idea of getting all the gas burners to go along with it in order to make the electric/alternative-fuel crowd 'Pay their fair share.' I don't see this going through Congress intact as a Federal measure, either.
