Engine
The gas/petrol engine used in Toyota hybrid technology is more energy-efficient, producing higher output than conventional gas/petrol engines.
The new (2009) Prius' 1.8L 2ZR-FXE high-expansion-ratio Atkinson cycle engine replaces the former 1.5L 1NZ-FXE. The wealth of torque created by an increased displacement decreases the engine rpm during high-speed cruising. Further improvements in fuel efficiency have been achieved through the following new mechanisms.