Evans Waterless Heavy Duty Coolant Increases Fuel Economy, Reduces Emissions and Lowers TCO in Independent Testing. Evans Cooling Systems, Inc., developer of the only waterless engine coolant, reported that recent testing with Emisstar LLC, a nationally recognized emissions testing firm, showed a reduction of 3.6% in CO2 emissions and a 4% fuel economy improvement. Emisstar is a clean energy and emissions technology consulting firm that provides independent third party testing services for the development of sustainable transportation technology strategies.