Cruising in Neutral in a car with a Manual tranny does NOT save gas. When the car is in neutral, the car burns gas to maintain Idle. If you coast in gear with your foot off the pedal, you are NOT burning any gas. The engine is effectively acting as an air pump. Of course this doesn't take into account that you will be slowing down due to engine braking, and you might have to apply the gas again to make up for it, compared to coasting in neutral where you will lose speed much less rapidly.