priusinChicago 
2009 Toyota Prius Hatchback 4dr Hatchback (1.5L 4cyl gas/electric hybrid CVT)
Problems in Winter
 Toyota Prius was pretty good, basically a 4 out of 5 in all respects except mileage, and then it was a 5 out of 5 until the very cold weather set in. Mileage went down from 46-50 mpg all the way to mid 30s mpg when it was in the 20s outside. And in the very cold (teens or near zero degrees Farhen) when you use the heater it went down to 27 to 30 mpg.  This was a disappointment on all counts with winter and cold weather mileage.