There's no need for a gas tax.
As the oil stockpile is reduced, gas will rise above $3.00/gallon, people are then forced to make choices.
No, that's what happens when technology is ignored. Consumer demand force car makers to deliver
same size and performance vehicles but the regulations force them to do it with better fuel economy.
As discussed elsewhere, the new regs use uncorrected EPA scores,
a lot of vehicles do meet the standard already including most F150s.
So relax the sky isn't falling.