When going downhill, leave it in gear (as higher gear as possible so the car rolls faster).
The ECU shuts off the fuel injectors when you are motor-braking. If you leave it in Neutral, you will use more fuel since the engine has to keep the revs at 700rpm (although the fuel usage at 700rpm is next to nothing anyway so there wont be much difference really).

 
			
 
			
			 
					
					
					
					
				 Originally Posted by aaronng
 Originally Posted by aaronng
					
 
						
 hopefully it's true but with also a great output power..
 hopefully it's true but with also a great output power..
						
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