You do not save fuel by coasting in free gear. This is a myth that may have applied when engines required carburetors. Today’s vehicles have computerized fuel-injection systems that sense if an engine is revving above idle when you ease off the accelerator. If that happens, the fuel injectors shut off, so petrol is no longer injected into the engine, even if the car is still in gear. The only thing you accomplish by constantly shifting in and out of neutral is premature wear on all your shift components.
