The ECO light is the 'same thing', per se', as my 'Fuel Saver' light, other than you also have the iDFSO program and I don't,,,

In my 09, I can let off the gas all the way and I'll coast for a 'several seconds' (~5~) before the FS light comes on,,, When it does, I do not notice any difference at all in the rate of deceleration. Pretty much seamless on decell,,, Almost seamless when engaging while maintaining a constant speed,,,

I think all of the MDS equipped v-8's run in 8 cyl mode when idling,,, I kinda wish all that time spent at stoplights would be spent in 4 cylinder mode, but,,,

 

Well, I did notice that even though my MDS was off, when I would release the accelerator pedal completely, my "ECO" light immediately comes on and the instantaneous MPG bar graph goes all the way to the right. Now I have to see at what speeds I notice the pronounced drag feeling.

 

Hmmmm, no bar graph here,,, just the FS 'light', and a digital (cumilative) MPG readout on my EVIC

 

[QUOTE=JoesBrotherRamMan;1979529]Your point isn't abstract to me. I to noticed this after purchasing my 2010..more so than the other vehicles I drive, including a 1995 F350..I think it has to do with the way these things are geared, they have an awful lot of snap under throttle, which I contribute to the physics of the drivetrane..however with great snappy throttle comes poor gas mileage, and superior drag when off the throttle. That is the work of the drivetrane pulling back on the truck

I have simaler issue and it seems like Drivetrain resistance more than normal in coast. I also have loose exauhst manifold flange pipe both sides. Can that cause a compression braking so to speak?

 

does this happen after you have come out of 4wd? Mine does the same thing but only when I have had it in 4wd and moved back to 2wd. I've found the only way to stop it is to shift into neutral and go into 4 low then go back to 2wd, drive forward and reverse in both.

I talked to a couple dealerships about it but they just look at me like I'm crazy.

 

You realize this thread is 10 years old?

 

yup, don't really care. Only place online I can find that talks about this issue.

 

How about the guy you quoted hasn't been here in ten years. Care about that? I hope you don't really expect an answer from him.......

And yeah, if you let off the gas, the truck is going to slow down. It's big, it's heavy, and has the aerodynamics of a brick......

Now, if it slows down faster than you think it should..... might be a dragging brake.

 

wow, you're kind of a dick hey? Do you just like to chirp ppl on here to make yourself feel like a big man?
if that were true then why is the problem fixed when I do this and coast like normal. Truck or not the vehicle shouldn't drive as though the brakes are constantly applied.

 

Yes, I pride myself on being the dick that I am. I have spent a great deal of time and effort to accomplish that, especially to folks that don't seem to pay attention to what thread they are posting in, how old it is, and if any of the participants are even active any more. (that would be you, in case you were wondering.....)

All that aside, I simply pointed out that this thread is old. You are the one that seems to have taken offense at me pointing out a simple fact. If you are that thin-skinned, maybe the internet isn't the place for you.......

Also, using your 4x4 on high traction surfaces is a REALLY bad idea, and tends to break things.