The energy efficiency performance of PHEV and EREV depends on specific usage scenarios. PHEV employs a parallel drive system combining engine and motor; the engine's direct drive is more efficient during high-speed cruising, with a combined fuel consumption typically ranging from 5 to 7 litres per 100 kilometres, making it suitable for long-distance high-speed travel. In contrast, EREV is always driven by the motor, with the engine solely functioning as a generator. It delivers superior energy efficiency during urban commuting, but due to energy loss from secondary conversion at high speeds, fuel consumption may increase to 6-8 litres per 100 kilometres. From a technical perspective, PHEV features dual power redundancy (fuel and electric), offering broader applicability; EREV provides a driving experience nearly equivalent to pure electric vehicles but exhibits higher battery dependency. Both technologies significantly reduce carbon emissions, with the optimal choice requiring comprehensive evaluation of individual driving patterns, charging availability, and budget constraints.
