Next Toyota Prius Hybrid: 40-Percent Thermal Effiency From Engine, Toyota Says

You may not hear about the thermal efficiency of engines much: It’s the ratio of how efficiently they use the energy in the fuel they burn. Conventional gasoline engines have long run about 25 percent, diesels at 30 to 35 percent. But the gasoline engine to be used in the next generation of the Toyota Prius hybrid will achieve a remarkable thermal… …read more