It is a form of rationing. Gov't control of distribution will itself cause shortages, and wouldn't be done unless there were also the other attributes of national mobilization for war such as the draft and price/wage controls.
For the duration of the emergency, gas users will have access to magnetic debit cards in which are embedded a national quarterly target of per-consumer gasoline. Drivers whose allotted amount of gas doesn't meet their needs can buy part or all of someone else's allotment. For the average driver, this distribution plan would not increase gasoline costs. A consumer would pay the same out-of-pocket cash per gallon, and the government wouldn't get its hands on any more of the taxpayers' dollars. It is a more efficient way of distributing energy because it employs market incentives to allow heavier gasoline users to get what they need without increasing overall consumption of energy.
What's your take on his comment that the government would not get more taxes. Is he just saying that the price of gasoline would be less since the government was setting it or is there more to it than that. Perhaps this voucher/rationing suggestion is meant to protect truckers, farmers and the like.