Efficient cars maximize the amount of energy generated from the combustion of gasoline that goes to rotate the wheels. In any mechanical system, energy is lost in the process that the machines takes to transfer motion due to friction or inefficient components. Efficient cars have engines that maximize the combustion of gasoline, burning as much of the fuel as possible. Burning gasoline is a chemical reaction, and no chemical reaction goes to 100% completion. In fact, it is difficult to make an engine run at 50% efficiency, let alone 100%. Then, an efficient car minimizes friction in moving parts. Also, efficient cars use computers to monitor precisely how much gasoline is flowing into the engine as well as determining optimal points to shift gears. Even more efficient cars will have low rolling friction tires to minimize resistance on wheel rotation. All of these components and more make for an efficient car.
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