Does It Consume Fuel Without Pressing the Accelerator?

[AndersonRose]

Idling without pressing the accelerator still consumes fuel. Here are the details: 1. Under idle conditions: Not pressing the accelerator and not supplying fuel can only be achieved under certain conditions between vehicle speed and engine RPM, and it is not absolute. It definitely won't work at lower speeds. Specifically, the engine needs to consume a certain amount of fuel to maintain its operation; otherwise, the car will stall. 2. At higher speeds: When the vehicle reaches a certain speed, even if you stop pressing the accelerator, the engine already has sufficient RPM. The kinetic energy from this RPM is enough to keep the engine running without consuming fuel, preventing it from stalling. In this case, as long as you don't press the accelerator, the system will interpret it as waiting for the vehicle to decelerate and will cut off fuel injection, relying solely on the existing engine RPM (i.e., kinetic energy) to maintain operation. This is also the principle behind so-called "engine braking."