I'll start this one off. Got knocked down by short trips over the weekend, so I only had 48.5mpg to look at when I walked out there this morning. It's *#&%* cold! 7-9F temps with head and side winds in the 15mph range. Best I could do was to bring it up to 48.6mpg. I'm actually happy about that...I expected a loss! The only way to pull that off in a Prius in these temps is to bundle up and run without cabin heat. (If my commute were any longer than a half hour there's no way I would be able to do it.) The engine will shut off after the first four miles or so but the HV battery won't ever get warm enough to stealth. P&G works but only just...problem is that the car doesn't want to roll.