You're missing the point genius. Removing the gas tax doesn't increase supply. In the short term (and the proposal is short term) the oil companies aren't going to produce any more gas then they are producing right now.
And you my friend are missing the point of this entire thread, which is NOT the gas tax holiday the McCain (and H. Clinton, during the primaries) have proposed. It's about increasing the price of gasoline by raising the tax. If, as proponents of this increase claim, the loss in revenues has been caused by reduction in purchases by consumers (further reducing the pressure on refineries, by the way), which ultimately has been caused by higher gasoline prices, WHY in the world would
anyone with even average intelligence think that increasing the tax further (and hence the price at the pump) would not simply result in still lower revenues?
As has been pointed out, the primary driver of the most recent increases in refined gasoline is
not] lack of refinery capacity (though it was in the immediate aftermath of Katrina, due to damage to refineries). It is because of the doubling and nearly tripling of the cost of crude, which is not affected by refinery capacity. If anything, a shortfall in refining capacity should cause a drop in crude prices, since demand for crude would be throttled by ability to process it. For the record, I opposed the gas tax holiday when Hillary proposed it, and I still think it wouldn't help much at the pump today. There are a number of things that would.
1) Immediately lift the ban on off-shore and open ANWR to exploration/production. This would put a whopping hole in the speculation bubble that has been a driving factor in high crude prices (note that while world-wide demand certainly is also a factor, demand has not trippled, but the price of crude has)
2) Immediately begin the effort to streamline licencing of Nuke plants and new/upgrades of oil refineries (so refining capacity can keep pace when needed at some point)
3) Increase the margin required for oil futures speculation to at least 50%
4) Develop incentive packages for states and industry to develop alternate sources of automobile propulsion (hydrogen is my personal favorite) and the infrastructure to suppor them.
Some of these would have short-term effects (bursting the speculation bubble), some mid-term (2 to 10 years, such as increasing production of oil), and some long-term (new technologies for powering cars and shifting electricity production from fossile fuels to alternatives. The point is, within 10 to 20 years we could be energy independant, while still running a growing and vibrant economy (which requires energy consumption, and can not be sustained simply by energy conservation.