Do you mean they turn off while rolling in neutral or with the gear in? Sure, the injectors turn off when you're decelerating in gear, but that's true even if t

Do you mean they turn off while rolling in neutral or with the gear in? Sure, the injectors turn off when you're decelerating in gear, but that's true even if the car doesn't have a start-stop system. However, I was talking about the case of decelerating in neutral with a car having a start-stop-type system. Rolling in neutral is always more efficient if the fuel is also cut off, but often even with the car running on idle.