Gear shift from D to N

[Azner Garcia Granado]

Hello, I need to know if I can Gear shift from D to N while my car is moving, Im concern about the transmission,

 

Regards,

Azner

[Azner Garcia Granado]

Sorry my car is a GMC Sierra 2014

[Azner Garcia Granado]

I need to know if I can do that, because where I live there is a lot of Hills and this will let me save gasoline 

[Azner Garcia Granado]

I need to know if I can do that, because where I live there is a lot of Hills and this will let me save gasoline 

[CamGTP]

Can you do that, yes. But is it saving you anything by doing that, no it's not. It puts wear on the transmission as well.

 

Vehicles for the past 25+ years or more have had a thing called deceleration fuel cut off. When your foot if off the throttle and you are coasting to a stop or coasting down a large hill, all of the fuel injectors turn off completely.

 

You can even watch this on your dash if you have that feature. Watch your instant fuel mileage in the cluster, when it pegs the gauge out to 99 MPG, there is no fueling being used at all because the computer has turned off the injectors.

[Mawz]

Pay attention to CamGTP, he’s 100% correct.

You will actually burn more fuel by dropping it into neutral as deceleration fuel cutoff only works when the vehicle is in Drive or L (as the wheels can’t force the engine to turn in N, so it has to burn to stay on)

[Mawz]

Oh, as an FYI, even without deceleration fuel cutoff, pushing into N doesn’t save fuel coasting. You would have the engine getting idle throttle either way, which is the same fuel burn.

All pushing into N on a downhill does is cost additional brake wear, because you lose a small amount of grade braking from having the wheels drive the engine, so you need to use more brake to maintain speed.

[Peter Thiessen]

I believe that Azner is thinking that he can coast farther in N, than in gear(which is probably true),thus saving some fuel. 

[Azner Garcia Granado]

Right Peter, changing from D to N will let me go forward and far without any acceleration of the motor, and then I think that I will save gas because I can go more far without accelerate the car, and there is my concern related to the transmission because some people told me that this operation can damage the transmission due to the oil pump inside the transmission

[CamGTP]

The transmission oil pump is always spinning if the engine is running. The flex plate and torque converter are always connected.

 

Seems like a hassle to try and get every last mile per gallon, the minimal savings isn't worth it to me. Drive slower if you want better fuel mileage.

[CrawlSlow]

The idea of possibility saving 1 cent a year is not worth it. You driving the wrong vehicle... The money you put into gas along is enough to pay for a car payment. 

 

The best way to save gas in a Silverado is to not drive a Silverado. 

[swathdiver]

11 hours ago, Azner Garcia Granado said:

Right Peter, changing from D to N will let me go forward and far without any acceleration of the motor, and then I think that I will save gas because I can go more far without accelerate the car, and there is my concern related to the transmission because some people told me that this operation can damage the transmission due to the oil pump inside the transmission

Leave it in gear, you'll need the engine braking if some knucklehead stops down the hill in front of you.

[Azner Garcia Granado]

Ok, thanks to everybody, I will no release the transmission then, thanks for all your advices,

 

Bigs hugs,

Azner