In order to save fuel, is it correct to descend a slope with the gearbox in neutral?

Question

DentroTest · Accepted Answer

The correct answer is No, because control can be lost.  There are two fundamental reasons to avoid this practice: Safety (The main reason): By putting the vehicle in neutral, you eliminate the engine braking effect. The car will accelerate due to gravity, forcing you to use the foot brake (service brake) excessively and continuously. This causes brake overheating (known as brake fade), which reduces their efficiency and can lead to a total loss of vehicle control. Economy: Contrary to popular old beliefs, coasting in neutral consumes more fuel than going downhill in gear. In modern fuel-injection vehicles, when you lift your foot off the accelerator while in gear, the system cuts off the fuel supply (zero consumption). However, in neutral, the engine needs to inject fuel to maintain idle speed and prevent stalling.

In order to save fuel, is it correct to descend a slope with the gearbox in neutral?

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