Is It Normal to Drive at 80 km/h in Fourth Gear?

[VonSophie]

Driving at 80 km/h in fourth gear is not normal and is considered low-gear high-speed driving, which results in high fuel consumption and can damage the engine. There are three key points for engine maintenance: 1. Clean the air filter: The air filter is crucial for the engine's air intake during driving. If the air filter is clogged or accumulates excessive dust, it will restrict the engine's air intake. Additionally, a large amount of dust entering the cylinder will accelerate carbon buildup, leading to poor ignition, reduced power, and naturally increased fuel consumption. 2. Remove throttle valve sludge: Sludge forms due to carbon deposits from fuel combustion exhaust at the throttle valve and residues of impurities not filtered by the air filter. Excessive sludge can cause air resistance, leading to increased fuel consumption. 3. Clean injector carbon deposits: The combustion chamber is prone to carbon buildup, which can make starting difficult. Carbon deposits on the injector can also clog fuel passages, distort gasoline injection, and reduce atomization, naturally increasing fuel consumption.