If you cut the gas tax, and the price doesn't fall, that is not good conservative policy, and it's not good politics. In fact, it's a conservative nightmare that the Dems will rant about for months. If you cut the income tax, then you don't worry about whether it filtered down to the consumer in the form of a price cut at the pump.
You're wrong. Taxes are way too high. Everything is taxed. Everything. Most things are taxed two and three times. Reducing taxes is a basic tenet of conservatism. That includes all taxes. Its called fiscal responsibility. The gas tax is a regressive tax effecting low and middle income folks most significantly. Repealing the gas tax for 4-6 months is good politics. Cutting the gas tax permanently is sound conservative policy. Cutting federal income tax rates is also sound conservative policy. The federal governemnt should be satisfied with a 35% maximum federal income tax rate and a $2.8 trillion annual budget. $450 billion in deficits and a $9 trillion debt ceiling is more then enough irresponsible governance. The Feds don't need the 18-cents of federal gas tax.