As far as I understand, all hybrids are AT-PZEVs except the manual Insights and most of the first-generation Civic Hybrids. It's not about mileage; PZEV cars burn the gas in a certain way that doesn't release many pollutants, and they have various things for the gas tank to prevent fuel vapor from escaping, and they have filters to clean the pollutants that are created. None of this has anything to do with electric motors and batteries.

Remember there are a number of PZEV gasoline cars; xcel of course drives a PZEV Accord, and there's also a PZEV Fusion, Jetta, and probably many others.

If someone just wants a low-pollution vehicle, there are many choices besides just hybrids.