Tough call. In winter, the Prius will keep its engine on longer to keep warm, but it will allow it to turn off eventually, as long as you don't have the heat on full blast. I know the 2005 and earlier Civics would leave the engine on all the time if you wanted any measurable amount of heat at all; but with the redesign, I hope it has an electric heater in the 2006. It's probably a wash.SuperCharged said:Which hybrid system functions better the winter between Toyota and Honda. I live in Canada Quebec...
I heard that the Prius was dropping of 10mpg in winter, is it the same thing for the civic (2006)?
I think there's a bit more work to be done before you can feel safe about this. If the coolant is not circulating, the heater might keep the coolant in the thermos warm and toasty, but the coolant in the block would be just as prone to freezing (and block-busting) as before. So you need a circulation pump (or you need to power the one already in the Prius). The thermos pump in the Prius might not be rated for overnite continuous use (its usually only used briefly during start-up and shut-down).donee said:Hi DanMan32,
I have heard that coolant draining is done in Siberia from coleagues at work who grew up there. The problem is not so much to do with engine cooling, The Siberians removed the coolant from the engine to avoid cracking the block when the coolant freezes at 50 below 0 F overnight.
If there was a plugin heater in the Prius coolant thermos, then the Siberians would not need to drain the coolant from the engine. The Prius would do that for them. And one would think it would be easy to keep the coolant warmer than 20 below 0, in the thermos. . .