Ok guys, I'm seriously considering getting the Eco Tune done for better gas mileage.

Can I get some honest feedback on members who have had it done. I was under the impression when I bought the Liberty that I should get upto 26 miles a gallon. Typical highway is around 23.

Thoughts?

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"Never mind the maneuvers, go straight at "em," Lord Horatio Nelson

2005 Jeep Liberty CRD

I was getting 23-24 before the tune, now getting 26-28 avg after the tune. I'll post up real numbers later.

Dave

I didn't drive it much pre-tune, but I went from 27-28 to 32-35... I got just over 30mpg driving through the Rockies in a snow storm, in 4x4, at 60mph.

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2006 Jeep Liberty CRD, Limited
GDE Eco Tune, GDE TCM Tune, Bauer 203* Tstat, Amsoil EaA 201 Filter, Clean MAP, Samco CAC Hoses, Magnaflow Muffler #12226.
New Mopar Fuel Filter, K&N Filterminder, Fumoto Oil Drain Valve
225/75R16 Hankook Dynapros

I was getting 25 before and now am getting 28+

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2006 Liberty CRD Limited ordered new from factory. Born on date 2-2006 GDE
eco tune. Updated fuel filter head. No lift pump. Stock glow plugs.
Silverado 4x4
Corvette
1962 Ford Falcon
2005 John Deere 5425
1968 1\2 ton 4x4 short bed Chevy

Ok, here's the numbers, I got the ECO tune on 4-3-10. I didn't record MPG's before, but I checked it almost every fill up and it was usually between 23-25, mostly right at 24. These are all hand calculated, miles adjusted to match gps (X1.038)

Miles - Gals. -- MPG's
172.57 - 5.71 - 30.21
387.65 - 14.77 - 26.25
419.04 -15.88 - 26.38
517.44 - 18.04 - 28.68
417.17 - 14.85 - 28.08
524.4 - 18.68 - 28.07
372.12 - 11.94 - 31.16
307.35 - 10.83 - 28.4
355.31 - 13.46 - 26.39
519 - 19.31 - 26.88
138.36 - 4.58 - 30.22
358.73 - 12.88 - 27.85
475.92 - 16.04 - 29.66
339.11 - 12.66 - 26.76
184.04 - 6.73 - 27.33
318.66 - 12.49 - 25.49
290.54 - 10.05 - 28.9
407.41 - 17.04 - 23.9
488.79 - 17.43 - 28.04
268.42 - 10.7 - 25.07
411.56 - 14.26 - 28.85
447.58 - 16.9 - 26.46
-

dave

I On a trip I took from East liberty, OH to Akron, OH ~300 miles round trip, and driving a lil faster than I should, with no cruise (stupid wheel sensors) I got 23.3 mpg Pre-tune, and post tune I took my neighbor with so an extra 225Lbs in the Jeep and I got 27.4 mpg.

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2006 CRD, 111K, EHM, GDE Eco Tune, BF-Goodrich AT/KO, new alternator.....

Thanks Dave for taking the time to do this. Why is is that the mileage declines with amount of miles driven? I just graphed it. The less gas you pumped, the higher the likelihood you would get better mileage.
Scott

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2005 CRD Sport - "Blackie"
Tow Package
Trac Loc
GDE EcoTune w/ unl torque
Goodyear Wrangler SilentArmor Tires
over 192,000+ miles
100k mile service performed
5V Glow Plugs Installed and ECM updated

Fuel mileage on the over head went from 25-27 mpg to 28-30 now. Haven't done any hand calculated mileage. That's about 70-75% highway driving.

Seat of the pants meter, it has more power, gets going with less throttle input, trans seems like it shifts better too. Less smoke too.

The fun factor driving it now has gone way up...not that it was bad before the tune.

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2000 Dodge SLT 4x4 CTD Intense Blue, a few go fast goodys

2006 Limited CRD 4x4 Inferno Red, GDE ECO tune

Even if you get 0 extra MPG you will be glad you got the tune. But you will get a few more MPG then zero.

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20 year owner of Libby CRD!
2006 LTD Bright Silver loaded with all the needed mods, CCV intact.
Equipped with HDS thermostat, plenty of heat, faster warm-ups, increased fuel mileage.

Not really sure, but it does seem to bounce around a bit. I have been getting random P069 DTC's, that may have something to do with it. gonna order a new MAP sensor for that. it seems just the real low mileage ones are the highest, but the 2 over 500 miles were over 28 mpgs. Either way, I am getting a solid 3-4 mpgs better with the tune than before.

Dave

That is where I am headed. So far no big increase in mileage. I like that the CEL is off (I had a SEGR and never installed it, now for sale if any is interested PM me) and the Liberty does seem a bit quicker and smoother. I have filled up 3 times and the gain in MPG is not obvious yet. GDE gave some advice about clearing out the exhaust system. I will keep playing with it. A better test will be a long trip or towing where the baseline is more established.

Now I had a good running CRD, for folks with problems a GDE tune would be an obvious move.

x2. 0% MPG increase for me regardless of how slow I drive or how painfully slow I take off from red lights. However, the other benefits of the tune do make it VERY nice and I am very happy overall with the tune.

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2005 Stone White KJ Limited CRD 4x4
Off-Road Pkg
Trac-Lok
Emu 790s/948s
Skyjacker H7088s rear/Bilsteins front
15x7 Black Rock Lobos/31x10.50 Firestones
GDE HOT Tune + TCM Tune
Euro TC
CB radio
Thrush Turbo muffler
AEM DryFlow filter

This is off topic some but here goes...... I thought someone posted that if you don't have the GDE tune and you hold the break pedal and press the accelator pedal nothing would happen it would just idle? Well I never test that just believed it untill today I tried for some reason even not known to me and my engine will rev up. Is this normal is was what I thought I read not correct?

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2006 Liberty CRD Limited Deep Beryl Green Metallic Clear coat, Fumoto valve, MH ProVent (removed), GDE Eco tune,
OME 790/948 springs, OME struts, OME N132L shocks, Jeepin by Al A-arms, Hercules Terra Trac AT2 245/75R16
Weeks Stage 1 EGR delete, 5 volt steel glow plugs

Mine will do that too, but I think if you do it long enough you'll get an ETC error.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

I've put three tanks of fuel though my GDE Eco tune. I have to habd calc every MPG so unless the tune changed my trip, I am getting a little better fuel economy. I went from about 21-22 (10 mile drive to work 5 days a week in mixed traffic) to 24 MPG. I am also on summer fuel now, and I have been using Power Service additive, so that may have been the difference.

My thermo is dead, and I have been on new samco hoses for the last two tanks only. I am also pretty sure that I now have a fuel and air problem. I'm looking forward to this summer when I will be driving 400 mile round trips all highway to school twice a week to see what my MPG can get to. (Wait that doesn't make sense. Well at least I'll see if the tune saves me money)

Even if I don't get a MPG increase, I am happy with the money spent. It feels better, and I don't feel as sluggish when accelerating.

One interesting observation... It seems as though my car can't explode off the line if my wheels are turned... I mean there seems to be a turbo lag... I may be crazy, but even my wife said that. You can't even spin the tires. Does that make any sense? Is there a safe guard?

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2005 Black KJ Sport CRD,
GDE Full Torque ECO TUNE, GDE Transmission ECO Tune,
Samco British Racing Green Hoses
Build Date 1/05
200k miles.
Original Owner

I seem to recall that Keith had said there was a slight de-tune at low rpm to prevent the invocation of the dreaded shudder from the transmission. Above 2000 it boogies.

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2005 Sport; 56K miles; mostly stock (except for egr block and SEGR); Black/Grey Int.; Chrome Limited Grill (after Bambi encounter)