I run WW and water in my Z.
Just the WW added to the OEM fill helped a little, 3-4 degrees in normal use. The effect is a lot more dramatic with straight water.
Reducing your coolant mix to ~15% antifreeze (and thus raising your freeze temp to around 10-15 degrees F, so if you live in Fargo or something, probably not something you want to do) and adding WW will make a dramatic difference.
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