Your right the bigger issue is why should we subsidize one flavor of car and not beer or guns or fruitcake? What business does the IRS have in attempting to manipulate the legal behavior of citizens. - None if protecting liberty was the goal of government
No the bigger issue is what States are preparing to do as gas consumption is affected by more and more hybrids.
The Hybrid movement is real. It does and will continue to lower the rate of increase in consumption of gas at the pump.
So who do you think will be the losers as all auto mfgs transition to hybrids? And they are ramping up to do so now. In fact Toyota has declared that all their models will be hybrid.