Interesting article, and interesting Jay Leno clip. The article's claim about fuel economy, though, is not applicable to most unmodified vehicles. The engine management system is going to turn the fan on when the coolant reaches a programmed temperature. That will happen whether the system contains water, green coolant, orange coolant, or Evans waterless coolant. But if the fan control can be reprogrammed with a higher setpoint and/or a higher-temp thermostat can be found and can be installed without causing cooling-unrelated problems (such as hot-start/hot-idle issues in carbureted fuel systems), then you can realise a fuel savings.
Too many people who were born on third base actually believe they've hit a triple.