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Does Coasting in Neutral Save Fuel in a Manual Transmission?

2 Answers

VanEmerson

09/04/25 3:41am

Coasting in neutral with a manual transmission does not necessarily save fuel and may even increase fuel consumption. Many modern vehicles are equipped with electronically controlled fuel injection systems. When the car is shifted into neutral, the Engine Control Unit (ECU) defaults to an idle state, increasing fuel injection to maintain idle speed. The electronic fuel injection control system inherently has fuel reduction or cut-off functions. Utilizing neutral coasting in such scenarios not only negates these functions but also increases fuel injection. The potential damages of coasting in neutral with a manual transmission include: 1. Causing jerking sensations; 2. Reduced braking efficiency; 3. Negative impact on engine lifespan; 4. Increased risk of transmission gear breakage.

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McJuliet

09/16/25 4:49am

I've been driving manual transmission cars for over 30 years. Back then, old drivers taught me that coasting in neutral could save some fuel, but I later realized that was a misconception. Modern car engines are electronically fuel-injected. When coasting in gear, the wheels turn the engine and the system automatically cuts off fuel injection, using almost no fuel. In neutral, however, the engine has to maintain idle speed, continuously consuming fuel to keep the RPM. From a safety perspective, coasting in neutral is also dangerous as you lose engine braking and rely solely on the brakes to slow down. In emergency turns or sudden situations, the slower response time can easily lead to accidents. When driving, I always make it a habit to coast in gear - it's more fuel-efficient, stable, and protects the brake pads' lifespan. I've seen many friends coast in neutral only to find their fuel consumption data actually increases. Don't be misled by traditional thinking; always check the manual or consult professional mechanics.

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