The objective of the project was to assess the impact of a solar reflective windshield and backlite on PHEV range and fuel economy. The effect of Sungate EP on PHEV performance was evaluated on NRELs PHEV test bed, a 2006 Toyota Prius modified with a 5 kWh Hymotion Li-ion Energy Storage System. The tests, performed at Environmental Testing Corporation in Aurora, Colorado, used portable electric heaters installed in the passenger compartment to simulate the solar heat gain through the glazings. A vehicle thermal analysis determined the thermal loads from the glazings (including transmitted, re-radiated, and convective loads) which were simulated with the electric heaters. The thermal load for Solargreen glazings installed in all positions was 1629 W. For Sungate EP in the windshield and backlite and Solargreen in the sidelites, the thermal load was 1264 W.