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Four-Wheel Drive

On a four-wheel drive (4WD) vehicle the power from the transmission is transferred to the rear and/or front wheels. On a four-wheel drive vehicle the operator has the choice of selecting either two-wheel drive or four-wheel drive. Many trucks have this option. Four-wheel drive vehicles have lower fuel economy than two-wheel drive vehicles. This is caused from the addition of friction from the drivetrain turning more components.