Did 100 miles, 14 F on the way home, between my Firstgear thermo suit and Hippo Hands, I didn't even need the heated gear, I turned it off the last 20 miles, just to see, and I was fine. I'd love to let you all think I'm a manly he-man, but the truth is, I'm never cold, I hate being cold as much as the next guy. Just have to dress for it.
What impresses me is that the old girl starts and runs in these temps, I'm running 20w-50, I meant to change it to 10w-40 for the winter, but never got around to it., Not bad for a 33 year old bike.