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  #13  
Old 08-29-2015, 08:17 AM
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Re: 100 mile MPG challenge

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Originally Posted by stician View Post
Not yet. But in the past I have and never had an optimistic reading before and after tune. I usually measure per tank.

Are you using any fuel additive, or just straight fuel?

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  #14  
Old 08-30-2015, 04:33 PM
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Re: 100 mile MPG challenge

My GDE EVIC always reads +2 to 3 mpg. It's gotta come down to driving style. Lots of times going up on ramps accelerating I'll see 6mpg instantaneous and if I slow down a bit it still stays the same. I think these little differences, or lack thereof, combined with my lead foot tendency add up after 600 miles or so.
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  #15  
Old 09-14-2015, 12:57 AM
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Re: 100 mile MPG challenge

My stock Jeep's EVIC average mileage is usually about 1.5 MPG higher than hand calculations when filling the tank. Maybe someday when I have more time, I'll try driving 60 MPH between Fargo and Grand Forks where the only hills are railroad overpasses to get real numbers at lower freeway speeds.
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  #16  
Old 09-14-2015, 06:46 AM
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Re: 100 mile MPG challenge

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Originally Posted by Roadkill View Post
Owners of the GDE tune are reporting optimistic fuel economy readings from EVIC that exceed manually calculated fuel economy.

YMMV.

To be fair, my EVIC did so by the same % with the stock ECU. It's something about the extremes and the way it's calculated. In mixed driving they are both almost dead on.


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  #17  
Old 09-14-2015, 06:50 AM
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Re: 100 mile MPG challenge

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Originally Posted by dsears00 View Post
To be fair, my EVIC did so by the same % with the stock ECU. It's something about the extremes and the way it's calculated. In mixed driving they are both almost dead on.


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I've noticed it is dead on in mixed driving from full tank to full tank too. Having GDE has kept it above 30mpg for the past 2800 miles.
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  #18  
Old 09-15-2015, 11:43 AM
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Re: 100 mile MPG challenge

Stician,
That is some outrageous stuff! Performance & economy have a cost and I'm not trying to be a wet blanket here, but my napkin calculation is a 28k miles ROI. Based on:
diesel = $3/gal
existing mpg = 24
new mpg = 31
GDE ECM = $800
Diesel goes to $3.50/gal, then ROI = 24k miles; $4/gal = 21k miles

Better ass kicking torque and driveability is hard to quantify in $$ so spending $ on speed is mostly always qualitative in nature. I added a MAF and custom exhaust to an Expedition to get +1.5mpg to 15mpg and ROI was 20k miles and I made out like a bandit.

Do you think that is a fair assessment of the GDE ROI, etc?
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Old 09-15-2015, 12:13 PM
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Originally Posted by midsouthduckhunter View Post
Do you think that is a fair assessment of the GDE ROI, etc?
Yes, but there are also additional intangible considerations, such as not having to deal with horrible EGR carbonization or the threat of having one's vehicle disabled by EPA-mandated firmware code.

The people buying a tune are most likely intending to own it for a long time, so these aspects would be likely more valuable to that demographic.
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  #20  
Old 09-15-2015, 12:20 PM
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Re: 100 mile MPG challenge

Smiles Per Miles sir. GDE improved driveability and seat of the pants power. There's torque every where.

I was pleasantly surprised to see MPG in the JGC far exceed their RAM test truck. 36 hand calculated MPG on a recent 300 mile trip down the I95 through congested Baltimore-DC area.
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  #21  
Old 09-17-2015, 11:31 AM
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Re: 100 mile MPG challenge

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Originally Posted by Roadkill View Post
.
The people buying a tune are most likely intending to own it for a long time, so these aspects would be likely more valuable to that demographic.
I find that difficult to believe. What is your basis? Do you have this tuning and what is your personal ROI?
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  #22  
Old 09-17-2015, 12:10 PM
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Re: 100 mile MPG challenge

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Originally Posted by midsouthduckhunter View Post
I find that difficult to believe. What is your basis? Do you have this tuning and what is your personal ROI?
I think he was supporting additional benefits of owning the GDE tune beyond ROI. To that I agree with him 100%.

To be fair to FCA there are high mileage EcoDiesel out there without a GDE tune.

I like the power and improved throttle response the most.
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  #23  
Old 09-17-2015, 06:29 PM
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Originally Posted by midsouthduckhunter View Post
I find that difficult to believe. What is your basis?
Eh? This tune disables EGR. Look at the photos of the buildup on the valves on these EcoDiesels that occurs in under 20k miles. This is less likely to be a catastrophic problem during the warranty period, but if you're planning to drive this thing until the wheels fall off...

Also, as I referenced, this tune disables the EPA-mandated firmware code that kills the vehicle if there is a problem with the DEF system. Therefore, one doesn't have to worry about being stranded because of the EPA. I counted this as an intangible benefit. There are other "intangible" features too, but those two were the first that came to mind.

If an owner is planning to trade in the vehicle within a short period then it becomes an expensive exercise to buy the tune. In fact, it might even add negative value to a trade in if it were disclosed (due to warranty considerations). Furthermore, it's not like an owner can resell the tune to the owner of another Jeep: it's locked to the VIN.
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  #24  
Old 09-21-2015, 10:52 AM
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Re: 100 mile MPG challenge

Quote:
Originally Posted by Roadkill View Post
Eh? This tune disables EGR. Look at the photos of the buildup on the valves on these EcoDiesels that occurs in under 20k miles. This is less likely to be a catastrophic problem during the warranty period, but if you're planning to drive this thing until the wheels fall off...

Also, as I referenced, this tune disables the EPA-mandated firmware code that kills the vehicle if there is a problem with the DEF system. Therefore, one doesn't have to worry about being stranded because of the EPA. I counted this as an intangible benefit. There are other "intangible" features too, but those two were the first that came to mind.

If an owner is planning to trade in the vehicle within a short period then it becomes an expensive exercise to buy the tune. In fact, it might even add negative value to a trade in if it were disclosed (due to warranty considerations). Furthermore, it's not like an owner can resell the tune to the owner of another Jeep: it's locked to the VIN.
Good to know about the DEF so that is definitely a nice, soft benefit. GDE doesn't have too many product offerings but all the other tuning mfg's give you a pretty nice credit if you switch vehicles and remove the tune. It is locked to the VIN so you can't copy it w/o removing it first. I know Hypertech only cost another $100 if you switch. Chip mfg's offer a crazy discount to military/law enforcement/fire dept folks as well and they stop by for tunes for their personal and state vehicles. Unless one is swapping ECM's, buying tuning is not like installing a new cam or intake. We've had leased vehicles I put a chip on; saying one buys a chip only if they keep the vehicle a long time simply isn't accurate. That is primarily why I questioned the statement that people buying tunes are keeping their vehicle a long time. None of you guys confirmed/denied any of my calculations, so for me $28k miles is about 16 months. Unless I smash it or it really starts screwing up, there is no way I would get rid of it before then.

I started my question saying I didn't want to be a wet blanket and meant it too. I've gotten a bit stingy in my old age and don't hang shit on my vehicles unless it adds performance in some way. Performance being torque, mileage, handling or functionality (fender flares/mud flaps, better shifting, ecm parameter changing). If I need to replace parts I'll replace with a performance part but I don't swap normal wear parts before they need replacing. It may look cool, but if it doesn't do anything for me, it isn't in my wheelhouse.
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