I've recently started coasting, in neutral, to improve my mileage. In general, my mpg has increased a bit, especially driving hilly terrain, like the CO passes. I'm wondering if there is a downside to coasting, like clogging up the injectors, etc. I stomp on the go pedal at least once a tank to clear things out. (Yeah, lot's of smoke.) Any info would be appreciated. Thanks.

 

For good fuel mileage you could always strap a raw egg to the pedal and try not to break it with too heavy a foot.

BTW, I bet that "stomping" will negate any gains you got from coasting. All that good mileage goes up in smoke.

 

I think someone who has had a diesel for long time should post some do's and don'ts for fuel milage driving. I'm still learning after a year of owning this truck that it is definatley different than driving a gas powered truck. I try and coast more now than ever, and I also put the truck in Nuetral at stop lights. This truck almost burns as much fuel in gear at idle as it does at 55mph in od

 

I've heard that the engine actually shuts off fuel flow when you are coasting downhill with enough RPMs to keep the engine rotating.

Shifting into neutral would require the engine to fuel itself to keep turning.

On a steep grade downhill, my boost will go to zero and the engine will become very quiet.

Brian Elfert

 

With mine its a bit differant, but mine is a manual. I will put it in neutral if I hit a decent down hill but not all the time. I dont hammer on it between lights like I see most people do. I just get going as slow as I need to go to get to the next light. No hammering the gas and then the brakes for me.

 

So you guys shifting into neutral, to coast, don't think the coasting carbons up injectors or anything else? That's why I stomp on it once a tank .. to burn off the carbon. If I stomp on it 2 times in a row, fI don't get any smoke the 2nd time. (Yeah, I realize I'm negating some of my coasting gains by doing this.)

 

How does shifting out of drive at a stop light save gas? The gas pedal hasn't moved.

 

Behrman, sorry if I wasn't clear. I mean coasting on downhill sections

 

I wasn't clear either. I was referring to GATF4 comment.

 

It must use a little more fuel stopped in drive because if you shift to N the rpms come up.
To me this indicates that it is under load in drive.

 

Nobody's mentioned it, and most may not care, but coasting in neutral is illegal in some, if not all jurisdictions.

 

When it was OK to not be politically correct, coasting in neutral was referred to as "Jewish Overdrive".

 

DustyRock, that is bad bad. For all you know half of those responding to this post are Jewish.

 

The devil made me do it.........

 

I always called it Oklahoma overdrive, will that offend the other half?