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On highway and proving ground vehicle tests were conducted in the Southwestern United States to compare the performance of propylene glycol and ethylene glycol based coolants. A cross-section of vehicles encompassing pickup trucks, large and small cars, a minivan and a sport utility vehicle from various manufacturers were included in the program. Test protocols were completed with vehicles ballasted to curb weight with a four passenger load, with and without maximum recommended weight trailers. On highway driving schedules were run simultaneously with each vehicle pair. Two sets of tests were completed with each pair; once with ethylene glycol/water coolant and once with propylene glycol/water coolant. This was done in an AB/BA test sequence to reduce the impact of different ambient conditions between test. Ambient temperatures during the testing ranged from 35°C to 50°C.