Which consumes more fuel: idling for 5 minutes or starting the engine?

[JoelLynn]

Idling consumes more fuel. Below is an introduction to idling: Introduction: Idling is an operating condition of a car, where the engine runs in neutral gear. Diagnosis of unstable idling: Uneven fuel injection or poor atomization from the injectors causes an imbalance in power output among the cylinders. If the oil pressure is too low, the fuel sprayed from the injectors may not atomize well or may spray in a line, and in severe cases, only droplets may be emitted, reducing the fuel injection amount and making the air-fuel mixture too lean. If the oil pressure is too high, the actual fuel injection amount increases, making the air-fuel mixture too rich. Faults in sensors or wiring can cause the control unit to issue incorrect commands, leading to improper fuel injection and resulting in an overly rich or lean air-fuel mixture, which is an indirect cause of unstable idling.