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.
I agree with increasing our oil supply. Hybrids are the answer to that. If we double the oil seller's supply, we have doubled our own. Your argument doesn't account for the fact that of all the oil we use, 35% of it is domestic. If that were to double and be 70%, we are almost there. Drill ANWAR and a few wetlands, and we are in the driver's seat. No more dependence on oil from hostile lands.
What you save in hybrids will be made up for by insurance for it. Those little cars don't look very sturdy for impact IMO.