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The general consensus is that the stuff does wonders for high horsepower hot rods that like to boil over during stop and go, low speed cruising. These owners usually have upgraded radiators and electric cooling fans to assist the air side heat exchange. Due to the increased viscosity and boiling point of the Evans coolant, some owners remove the thermostat altogether.
Other fanatic supporters with moderate horsepower machines run a high flow thermostat to assist with the cabin heater core operation in cold season driving. As far as maximum coolant temperature, the stuff runs a few degrees warmer than stock coolant, due to a few factors. The Evans coolant has a lower specific heat than stock, so as a drop in replacement, the Evans has to be a little warmer to move the same amount of heat. Also, since there's no boiling going on at the exhaust valve or piston wall areas, the heat transfer is actually higher than stock. Both of these factors contribute to higher coolant temperature readings at the sensors.
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