Head hurtted reading your question.

 

OK, so can somebody explain how this will possibly save you gas to put it in N? #1 your injectors are going to be giving your engine only a small ammount of gas unless you are pushing on the gas pedal. The difference between 500 RPMS and even 2K RPM's will save you little to no gas, while adding wear to your brakes. When driving a manual you shift to a lower gear to "engine brake" your car and it slows you down without using the brakes as much. This will not save you gas and after reading this just makes me think it does a lot of harm to a car.

 

hmmm...ok im never gonna do that...it scared me anyway.