According to the Cars Direct website, hybrid cars can achieve 51 MPG and destroy all efficiency expectations of petrol and diesel. This high efficiency is due to two main reasons: hybrid cars tend to be lightweight and the cooperation between the petrol engine and the electric motor. “According to consumer tests, most hybrid cars have better fuel economy than their gas-only counterparts” (Barett, “The Difference Between Gas and Hybrid Vehicles”). This is evident if we compare between a hybrid car and a petrol car of the same name: the average efficiency of the hybrid Honda Civic is 40 MPG while the average efficiency of the standard Honda Civic is 29 MPG, l The average efficiency of the hybrid Hyundai Sonata is 33 MPG while the standard The average efficiency of the Hyundai Sonata is 27 MPG, while the average efficiency of the Ford Fusion hybrid is 34 MPG, while the average efficiency of the standard Ford Fusion is 24 MPG (Barett) [average efficiency is the average of the car's efficiency in the city and its efficiency on the highway