I don't approach overall fuel economy from an environmental standpoint. I think it is strategically important that we reduce our dependence on Arab oil, and while were at it, Venezulean oil. I think the price of a gallon of gas within the next 10 years will make hybrids more attractive and they will be mass-produced in the not to distant future. Once economies of scale kick in, the hybrids will become affordable and the fuel savings will be worth it. At that point, they will be bought in mass quantities and in 10 years half the cars on the road will be a hybrid of one form or another. I love Rush, but to brag about owning a gas guzzler when it helps prolong the current Mid-East situation is pointless and sophomoric. But it is a free country and he can drive what he wants. I really do think our future is in hybrids, though. I will also put my money where my mouth is and start investing in companies that build/support this industry.
Personally I don't think hybrids are the solution -- every time we double efficiency we also essentially double the oil seller's supply. It's fine to drive a hybrid to save money, but you're not providing any incentive to reduce our dependence on foreign oil.
I'd prefer we move to alternative sources of energy for transportation, like nuclear, coal, hydrogen, etc.
And also start drilling in Anwar.