The test car in that article had an inadequate cooling system and was prone to overheating. That's why they chose it. In a properly designed cooling sytem the thermostat regulates the water temperature and therefore the guage will read about the same with or without a water wetter. The magazine test does demonstrate that these "wetters" do work at least to some extent, and they are handy for overtaxed cooling systems.
Either way... I was convinced of their value about 15 or 20 years ago and have been using them since.
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