New OEM Antifreeze Mix %

My wife panics sometimes when we get low windchill. (not complaining, ar least she is aware temps matter to the cars) ...While low wind chill conditions will cool it faster, it will still only go as low as the real temp

Yeah, wind chill is pretty much a myth. Put on a "windbreaker" you no longer have a wind chill. Inanimate objects aren't affected by it for the most part either.