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Which is more fuel-efficient: coasting in neutral or coasting in gear?

2 Answers

Maya

07/24/25 2:58pm

Coasting in gear is more fuel-efficient. Here are the specific reasons: 1. Coasting in neutral: For modern fuel-injected vehicles, coasting in neutral is equivalent to idling. The engine will still continue to supply fuel, although it consumes less fuel than during normal driving. 2. Coasting in gear: The engine is between low-speed fuel cut-off and high-speed fuel cut-off. At this time, the vehicle's computer will detect that the car is in an idle state, but the speed is higher than the engine RPM. The computer will then control the engine to stop supplying fuel. Therefore, coasting in gear is more fuel-efficient by comparison. 3. Precautions: Manual transmission vehicles should not coast in neutral because shifting to neutral while driving can cause wear to the transmission due to lack of lubrication from transmission fluid.

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DelJuliet

08/11/25 8:37am

Coasting in gear is more fuel-efficient than coasting in neutral, and I'm quite certain about this. When coasting in gear, the engine is driven by the wheels, and if the RPM is high enough, the fuel supply is automatically cut off, reducing fuel consumption similar to a fuel-cut mode. Conversely, when coasting in neutral, the engine remains idling and must continuously burn fuel to maintain operation, wasting fuel unnecessarily. While driving, such as when going downhill or decelerating, coasting in gear not only saves fuel but also provides engine braking to assist with deceleration, enhancing the driving feel. Based on my daily driving experience, adopting this habit can significantly reduce fuel consumption over time. Additionally, car manufacturers have optimized the efficiency of coasting in gear during design, making coasting in neutral more of an outdated misconception. For both cost savings and environmental reasons, I highly recommend sticking to coasting in gear.

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