Continuously variable transmissions (CVTs) have been growing in popularity over the last several years, and are steadily replacing traditional automatic transmissions in many small and mid-size vehicles. The primary reason being the increased fuel efficiency and smooth ride that come with CVTs: Unlike automatic and manual transmissions, CVTs do not use set gear ratios. This eliminates the characteristic jerking or jolting sensation that drivers feel when accelerating or decelerating, thus increasing gas mileage.  CVTs are especially common in Nissan,
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