Maybe there is a benefit from the WW/PI additive, if so, it cannot be seen in the charts. The 9 sec. difference shown is for water with WW vs. a 50/50 mixture of water and glycol. If you compare apples with apples, that is water with water + WW there is practically no difference. The same is true if you compare 50/50 mixtures with and without WW. Clearly the 9 sec. difference is due to the presence of glycol. Since there is so little difference due to the WW you might as well use water alone. I think.

JL