What is the difference between coasting in neutral and coasting in gear?

[RosalieMarie]

The specific differences between coasting in neutral and coasting in gear are as follows: 1. Operational difference: Coasting in neutral means shifting into neutral and relying on the car's inertia to move forward. Coasting in gear means remaining in gear without pressing the clutch or accelerator. 2. Fuel efficiency: When coasting in neutral, the engine may cause increased transmission wear due to poor lubrication. However, when coasting in gear, the vehicle's fuel injection decreases and gradually drops to zero. The vehicle remains in the "ignition" state, and the farther it coasts, the more fuel is saved. 3. Safety: If the car stalls suddenly while coasting in neutral, the engine, vacuum-assisted braking system, and hydraulic power steering system will stop working. This may lead to loss of control and potential accidents. In contrast, coasting in gear is safer because the car remains in the ignition state, allowing other systems to remain operational in case of emergencies, ensuring timely response and safety.

[Sylvia]

There's a big difference between coasting in neutral and coasting in gear. After driving for over a decade, I've witnessed many beginners make this mistake. Coasting in neutral means the wheels are disconnected from the engine when in N gear, and the car glides by inertia, which feels smoother. However, braking distance increases in this state, especially on downhill or slippery roads where loss of control is more likely. Low engine RPM also affects the responsiveness of the brake booster system. Coasting in gear, on the other hand, such as in 3rd gear or D gear, allows the engine to drag the wheels, providing additional braking force and enhancing safety. Current regulations recommend coasting in gear, debunking the outdated notion that neutral saves fuel. I always emphasize this point when teaching my daughter to drive – safety comes first. Modern engines can even cut off fuel injection when coasting in gear, making it more fuel-efficient. In short, coasting in neutral is convenient but dangerous, while coasting in gear is a sensible choice that also protects the vehicle.

[VanAyla]

Coasting in gear and coasting in neutral are crucial for fuel economy, and I often ponder these little tricks to save money. When coasting in gear, the engine drags the wheels, and the ECU automatically cuts off fuel injection completely, relying on inertia to drive the engine like a generator, thus saving fuel. With a manual transmission car, I’m accustomed to downshifting to utilize this mechanism. Coasting in neutral is wasteful, as the engine continues to inject fuel at idle speed to maintain operation, squandering gasoline. Research shows that coasting in gear can reduce fuel consumption by over 10%, adding up to significant savings in the long run. Especially in urban traffic with short-distance coasting, I prefer coasting in gear, as it doesn’t affect the engine’s normal temperature maintenance or lifespan. From an environmental perspective, this practice is also noteworthy for its benefits in reducing carbon emissions. Simply put, coasting in gear is one of the smart driving habits that can enhance efficiency.

[StTimothy]

From a mechanical perspective, coasting in neutral is much more harmful to the car than engine braking. As a car enthusiast who often studies internal structures, I can say that during engine braking, the engine resistance assists in deceleration, reducing wear on the brake system while maintaining smooth operation without issues. However, coasting in neutral suddenly disconnects the engine from the wheels, causing instant load changes that shock the transmission. This may accelerate clutch plate damage, increase overheating risks, and affect gearbox lifespan—especially in older models. In my daily driving, I prefer engine braking to maintain vehicle health and reduce maintenance frequency.