That Prius is ...How Much?

[bronsin]

Originally Posted by Cosworth

If the current generation Yaris had a "mild" hybrid setup for city travel, it's everything that one could ask for. In the city, Prius rules over Yaris.

But, I mostly drive on the freeway, so there's no sense in buying a Prius. I routinely get 40-45mpg on the freeway here in MI.

Since I drive mostly in town I wonder would the "shut engine off at lights" help mileage all that much? I have heard it does not. Since a feature of the Prius is a thermos that keeps coolant hot, perhaps plugging a block heater in with the Yaris will do thing mileage wise.