Except you don't save much by "getting rid" of car #2 because it is already a non-recoverable sunk cost. You could save money by not acquiring car #2 if you don't already have it or if it is time to replace it. But what are you going to do with car #2 that you already have? sell it? There isn't going to be much of a market for used gas guzzlers and any car loans are likely to go upside down like mortgages.

Now, there will be some market. Some will go the route of buying a used car rather than buying a new car with lackluster performance and buy a 100MPG+ car when those become available. Even a Prius only gets around 50MPG.

And with oil going up at 30% per year (give or take some recent fluctuations) or 14X per decade, it doesn't take that long before the marginal cost overtakes the upfront cost.