Sitting at a light, drop trans to neutral? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 37 (permalink) Old 01-25-2012, 08:00 PM Thread Starter
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Sitting at a light, drop trans to neutral?

So I have a scangauge on my truck that has been pretty well calibrated. It displays gallons per hour of fuel being consumed as a gauge.

When warm, at idle, and in neutral or park, I consume .40 gallons per hour. In drive, the engine sucks down 0.50 gallons per hour. A 20% increase.

Does anyone drop their trans to neutral at a stop to save the fuel? It's not quite as extreme as shutting off the engine as some folks do with their gas engines but if you can realize a 20% reduction....

Is there any harm to the trans done by excessive shifting into and out of drive?

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post #2 of 37 (permalink) Old 01-25-2012, 11:48 PM
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Re: Sitting at a light, drop trans to neutral?

and how long are you going to implement this savings? 20 seconds 1 minute?

I should ask what your reading this consumption ratio with??

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post #3 of 37 (permalink) Old 01-25-2012, 11:58 PM
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and how long are you going to implement this savings? 20 seconds 1 minute?

I should ask what your reading this consumption ratio with??
I think he has a scangauge 2.


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post #4 of 37 (permalink) Old 01-26-2012, 12:03 AM
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So I have a scangauge on my truck that has been pretty well calibrated. It displays gallons per hour of fuel being consumed as a gauge.

When warm, at idle, and in neutral or park, I consume .40 gallons per hour. In drive, the engine sucks down 0.50 gallons per hour. A 20% increase.

Does anyone drop their trans to neutral at a stop to save the fuel? It's not quite as extreme as shutting off the engine as some folks do with their gas engines but if you can realize a 20% reduction....

Is there any harm to the trans done by excessive shifting into and out of drive?
You will more than likely never see the savings anyplace other than your scangauge.
No I am pretty sure it would not harm your transmission.


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post #5 of 37 (permalink) Old 01-26-2012, 09:17 PM Thread Starter
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Re: Sitting at a light, drop trans to neutral?

Yes, the scangauge 2 that I've had for years it the gauge that displays fuel rate. Given our goofy fuel system it can't be very precise, accurate though.

So it might not be much but it's 20%. It seems like I'm sitting at lights for a long time. A very common hypermiling technique is to shut off the engine when the vehicle is not moving.

What else are you doing while sitting there? May as well save some fuel.

2000 F350 SRW, 4wd, CCSB, PSD
Lowered rear end to F250 height, 4" exhaust w/ muff, foil delete, AIH delete, Ford AIS intake, tru-cool trans cooler, autometer under dash pod and gauges, Mile Marker hubs, 04 headlights, soft tonneau

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post #6 of 37 (permalink) Old 01-26-2012, 09:30 PM
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Re: Sitting at a light, drop trans to neutral?

Im paying attention to traffic so that if some guy in front of me is sitting there trying to save fuel I wont give him a little bump when hes busy putting his truck back into gear when the light is already green. Plus while your fumbleing with the gear shift Im watching all the other idiot drivers so that one doesnt hit me or anything.

You arent going to save anything by doing that, just a waste of time.

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post #7 of 37 (permalink) Old 01-27-2012, 01:53 AM
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Yes, the scangauge 2 that I've had for years it the gauge that displays fuel rate. Given our goofy fuel system it can't be very precise, accurate though.

So it might not be much but it's 20%. It seems like I'm sitting at lights for a long time. A very common hypermiling technique is to shut off the engine when the vehicle is not moving.

What else are you doing while sitting there? May as well save some fuel.
You figure that It's 20% over the course of am hour right? So how much by volume do you think its going to be for the five min or so at the light.......by volume you would probably have to measure it in fumes and not ounces.

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post #8 of 37 (permalink) Old 01-27-2012, 05:39 PM Thread Starter
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Re: Sitting at a light, drop trans to neutral?

It's a fueling rate so a 20% reduction applies to every second as well as to an hour.

It doesn't take a rocket scientist to be able to bump the shifter into drive before causing a slow down to other drivers. Sheesh, if you aren't interested in saving fuel then leave this forum.

The better answer is that not much fuel is saved. Hardly worth the effort. If that is your answer then you've probably not spent much time reading into hypermiling techniques. We're talking about people who turn their cars around and park them facing the street when they return home at night since the warm engine will be more efficient during the turning around than a cold engine first thing in the morning.

2000 F350 SRW, 4wd, CCSB, PSD
Lowered rear end to F250 height, 4" exhaust w/ muff, foil delete, AIH delete, Ford AIS intake, tru-cool trans cooler, autometer under dash pod and gauges, Mile Marker hubs, 04 headlights, soft tonneau

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post #9 of 37 (permalink) Old 01-27-2012, 05:45 PM
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Re: Sitting at a light, drop trans to neutral?

If its not rocket science then why are you overthinking something that will gain you maybe a tenth of a mpg?

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post #10 of 37 (permalink) Old 01-27-2012, 09:02 PM Thread Starter
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Re: Sitting at a light, drop trans to neutral?

I don't think I'm overthinking, just thinking. Do you have anything to add?

2000 F350 SRW, 4wd, CCSB, PSD
Lowered rear end to F250 height, 4" exhaust w/ muff, foil delete, AIH delete, Ford AIS intake, tru-cool trans cooler, autometer under dash pod and gauges, Mile Marker hubs, 04 headlights, soft tonneau

18' 10k rated PJ car hauler
26' 7500# Creekside RV Trailer
Kioti CK30 tractor
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