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  #31  
Old 12-10-2010, 04:13 PM
WildlandFirefighter WildlandFirefighter is offline
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Default Re: ok to coast in Neutral on long downhill highways...

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Originally Posted by bluerang3r View Post
wont pushing in the clutch and coasting down a hill wear out the clutch and burn up the bearings? cause a clutch is like a brake pad. once the material is gone its time to get a new one.
Dude, I'm not sayin pushing in the clutch. Re-read my post.

Leave it in gear! NO PUSHING IN CLUTCH UNLESS YOU WANT TO SHIFT DOWN TO 4TH!

The guy doesn't need to put it in neutral....he needs to leave it in 5th gear and just let off the gas.
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  #32  
Old 12-11-2010, 04:30 PM
Coleosis Coleosis is offline
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Default Re: ok to coast in Neutral on long downhill highways...

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Originally Posted by WildlandFirefighter View Post
lol

Why not leave it in gear and just let off the gas.....
Well, yeah...but if you are going to coast I meant.

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Originally Posted by richarddhoward View Post
That is technically neutral, you aren't in an engaged gear driving the vehicle.
I know...but the way they were talking about leaving it in gear incase you need to go all of a sudden or something... If you just have the clutch in, then you release the clutch and you can move, dont have to get it in gear then release the clutch...IDK, aint no hills round hur, so i aint worried bout it.
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  #33  
Old 12-11-2010, 05:07 PM
WildlandFirefighter WildlandFirefighter is offline
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Default Re: ok to coast in Neutral on long downhill highways...

No reason to put it in N....your engine will still be running...just let off the gas....you never know your clutch might go out on you if you leave it in N....
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  #34  
Old 12-13-2010, 11:17 PM
Jwhite04 Jwhite04 is offline
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Default Re: ok to coast in Neutral on long downhill highways...

There is nothing positive about coasting downhill in neutral. Your putting extra wear on your brakes trying to maintain your speed, and are burning more fuel. When your in gear and off the gas your computer shuts off the injectors. This is how engine braking works, there is no power stroke, only the compression stroke. This is why big trucks use exhaust brakes, which basically simulate a second compression stroke by causing resistence on the exhaust stroke.
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  #35  
Old 12-16-2010, 06:44 AM
richarddhoward richarddhoward is offline
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Default Re: ok to coast in Neutral on long downhill highways...

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Originally Posted by Jwhite04 View Post
There is nothing positive about coasting downhill in neutral. Your putting extra wear on your brakes trying to maintain your speed, and are burning more fuel. When your in gear and off the gas your computer shuts off the injectors. This is how engine braking works, there is no power stroke, only the compression stroke. This is why big trucks use exhaust brakes, which basically simulate a second compression stroke by causing resistence on the exhaust stroke.
The exhaust brake is only available in diesels, it is not available in gas engines.
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  #36  
Old 12-16-2010, 10:30 AM
LittleBlackRanger LittleBlackRanger is offline
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Default Re: ok to coast in Neutral on long downhill highways...

Quote:
Originally Posted by bluerang3r View Post
wont pushing in the clutch and coasting down a hill wear out the clutch and burn up the bearings? cause a clutch is like a brake pad. once the material is gone its time to get a new one.
i do that going down my hill and i never thought just going down a hill with the clutch in did anything.
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  #37  
Old 12-20-2010, 12:13 AM
Blackhole2001 Blackhole2001 is offline
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Default Re: ok to coast in Neutral on long downhill highways...

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Originally Posted by rwenzing View Post
This is true.

As long as you keep your foot out of it and the RPM is above the cutoff, you will use zero fuel downhill. Coasting in neutral uses fuel at the idle rate, so you can actually save fuel by coasting in gear.

In some states, or maybe all, it is illegal to coast downhill in neutral. I remember this question being on the California driver's license test. Check your laws.
I watched a flat bed "tow truck" driver coast down a relatively flat slope for a couple of miles in neutral. Neutral idle RPM is around 700 rpm.
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  #38  
Old 12-20-2010, 05:38 AM
FireRanger FireRanger is offline
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Default Re: ok to coast in Neutral on long downhill highways...

Quote:
Originally Posted by Blackhole2001 View Post
I watched a flat bed "tow truck" driver coast down a relatively flat slope for a couple of miles in neutral. Neutral idle RPM is around 700 rpm.
So?
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  #39  
Old 12-20-2010, 07:45 AM
pooleo pooleo is offline
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Default Re: ok to coast in Neutral on long downhill highways...

I can contest to this, On several trips to Indianapolis from home I started to put my truck in neutral upon exit ramps, coasting to the light/turn. I also do this upong coming to stop lights. I saved close to an 1/8" of a tank in fuel doing this. So I would say that coasting in N is plenty fine and will save some gas. It normally was taking me 3/4 of a tank to make it from my drive to my cousins drive in Indy. By doing this, I was regualary arriving at his place 1/8th above 1/4.
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  #40  
Old 12-20-2010, 08:17 AM
FireRanger FireRanger is offline
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Default Re: ok to coast in Neutral on long downhill highways...

You contest this? So you think your truck uses more gas when no gas is actually flowing?
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Last edited by FireRanger; 12-21-2010 at 01:56 PM.
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  #41  
Old 12-21-2010, 11:37 AM
red_rider red_rider is offline
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Default Re: ok to coast in Neutral on long downhill highways...

Quote:
Originally Posted by pooleo View Post
I can contest to this, On several trips to Indianapolis from home I started to put my truck in neutral upon exit ramps, coasting to the light/turn. I also do this upong coming to stop lights. I saved close to an 1/8" of a tank in fuel doing this. So I would say that coasting in N is plenty fine and will save some gas. It normally was taking me 3/4 of a tank to make it from my drive to my cousins drive in Indy. By doing this, I was regualary arriving at his place 1/8th above 1/4.
Even if you were actually saving some gas (it was already stated that the engine uses 0 gas below a certain rpm in gear), you do realize that you're going to be working the brakes harder without any engine braking (unless you're letting off a mile before the stop). Also I'd agree with others that you're going to have less control in an emergency without any connection to the rear wheels to stabilize and slow down the truck faster.


Quote:
Originally Posted by Blackhole2001 View Post
I watched a flat bed "tow truck" driver coast down a relatively flat slope for a couple of miles in neutral. Neutral idle RPM is around 700 rpm.
That would seem to be pretty dangerous at highway speeds with something that heavy.
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Last edited by red_rider; 12-21-2010 at 11:39 AM.
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  #42  
Old 12-22-2010, 09:19 PM
2010 2010 is offline
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Default Re: ok to coast in Neutral on long downhill highways...

only reason i posted this is because i thought since rpms were low coasting in neutral compared to 3K coasting in 5th gear i thought it would save gas since rpms are lower than 3k, but it seems i am wrong.
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  #43  
Old 12-23-2010, 04:40 PM
Jwhite04 Jwhite04 is offline
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Default Re: ok to coast in Neutral on long downhill highways...

Quote:
Originally Posted by richarddhoward View Post
The exhaust brake is only available in diesels, it is not available in gas engines.
I know i used it as an example to explain how compression creates engine braking
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  #44  
Old 12-23-2010, 04:48 PM
pooleo pooleo is offline
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Default Re: ok to coast in Neutral on long downhill highways...

yes, on long trips it seems to make a difference. And were talking costing from a point where the truck will stop itself by the time you get to the light. Im not talking costing for 300 ft.
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  #45  
Old 12-23-2010, 06:07 PM
FireRanger FireRanger is offline
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Default Re: ok to coast in Neutral on long downhill highways...

Quote:
Originally Posted by pooleo View Post
yes, on long trips it seems to make a difference. And were talking costing from a point where the truck will stop itself by the time you get to the light. Im not talking costing for 300 ft.
Well your experiment is obviously flawed if you're saying the truck would use more gas with no gas flowing at all.
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