They are more efficient than if everyone was driving their own vehicles. Actually public transportation services are most efficient if they are operating at maximum capacity, as they are designed to carry a certain amount of people using a certain amount of energy. Now if the any of the vehicle is only half full it will still use the energy needed for transporting the full capacity. As far as consumption goes, their fuel used to power would seem high, but if we factor in the passengers carried it comes down to a fraction of the energy used when compared to cars for example.
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