WORSE——How many were not diluting ANY of their anti-freeze???
Used to bet people in Wisconsin bars that anti freeze would freeze. Straight anti freeze freezes very well in ice cube rays.
More so than 50/50 mix?
Glycol based antifreeze is most effective at a 50% glycol to 70% glycol dilution. 50% is good to about -37°C (-35°F). 70% glycol is good to about -50°C (-58°F).