I think if you read the WW bottle it performs best when mixed with just distilled water as a coolant. Any anti-freeze in the solution reduces the effects of the WW.
I was using it for a while and found to get noticable results, via the temp gauges, I had to lower the conc of 1825M down to where it would only protect to 5*C.....kind of useless in NYC if we get a real cold snap.
My eventual solution was to make & install the intake screen.
Flush & refill every two yrs with a new T-stat(OEM) & 1825-M.
I cleaned the cooling stack, rad and condensor fins of sand and ofcourse the leafs & candy wrappers
My side tank clamps were a bit loose so I cinched up the tank clamps, don't know if that did anything as there were no liquid leak trails.
Last step will be to buy better fans and maybe one of those super radiators when my OE one pops. I hear the plastic tanks crack eventually?
If you don't have to worry about freezing, I'd use the WW + distilled water + just enough 1825-M to protect the metal from corrosion...it would proly work well. JMHO
Tom