Fuel efficiency also depends on car aerodynamics
My neighbor Richard is very fond of car decoration and accessories. At the same time he is also worried about his mounting gasoline bills. He asked me about ways and means to reduce his fuel consumption and when having a look at his car I was astonished to see lots of accessories fitted in it which were unnecessarily increasing the weight of the car. I explained him the value of Car Aerodynamics and suggested him that he remove all unwanted extra heavy fittings from his car. He had some wings like fitting fitted in the rear of his car which were very heavy and although they were adding charm to the car but were acting against fuel efficiency of the car. After he acted as per my suggestions he has found the difference and his mileage has increased considerably.