After how many years does a car start consuming more fuel?

[DeLorenzo]

After three to four years of driving, a car starts consuming more fuel. Reasons for increased fuel consumption in cars: 1. Engine carbon deposits: Carbon buildup in the engine is an almost unavoidable issue, although the rate at which it accumulates varies between different vehicles. Carbon deposits can alter the opening degree of the valves and may also change the effective volume of the combustion chamber in the cylinders. These changes can lead to increased fuel consumption. 2. Tire wear: Excessive tire wear can affect tire performance, including fuel efficiency. Additionally, low tire pressure significantly increases the contact area between the tires and the ground and reduces the wheel radius, causing the vehicle to consume more fuel during acceleration.