Which is More Fuel-Efficient: Coasting in Neutral or Coasting in Gear?

1 Answers
LeDominic
07/29/25 8:50pm
Coasting in gear is more fuel-efficient than coasting in neutral. Here’s a detailed explanation of why coasting in gear saves more fuel: 1. Coasting in Neutral: In modern fuel-injected vehicles, coasting in neutral is equivalent to idling. The engine continues to supply fuel, albeit less than during normal driving. 2. Coasting in Gear: When the engine is between low-speed fuel cutoff and high-speed fuel cutoff, the vehicle's computer detects that the car is in an idle state but the speed is higher than the engine RPM. In this scenario, the computer will cut off fuel supply to the engine, making coasting in gear more fuel-efficient. 3. Important Note: Manual transmission vehicles should not coast in neutral, as doing so can lead to insufficient lubrication in the transmission, resulting in wear and tear.
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