Tuners/Gas milleage - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 08-06-2006, 11:27 PM Thread Starter
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Tuners/Gas milleage

anybody know if one tuner will get you better gas milleage outta it than another when driving it reasonably? I know a guy with an 03 runnin the bully dog and sees 19mpg average with a mix of hwy and city driving. wasnt sure if some tuners got better milleage or not?! I was gunu go with either bully dog or edge. i know that bully dog is internet upradable which i like. what about edge?
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post #2 of 11 (permalink) Old 08-06-2006, 11:39 PM
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I get around 18 mixed with my edge on level 3 or 4 all the time. I dont know how much the program in the ECM is affecting things, though.
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post #3 of 11 (permalink) Old 08-31-2006, 02:52 PM
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What are they using as the MPG reference?, the DIC or hand calculation?, most tuners will throw the DIC accuracy out the window.

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post #4 of 11 (permalink) Old 01-28-2007, 10:58 PM
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with the crazy larry setting on the bully dog on my 04' dmax i get about 24-29 city/highway and about 22 when pulling my tile trailer which is about 4500lbs..
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post #5 of 11 (permalink) Old 03-20-2007, 05:04 PM
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Thats hand calculated or from the DIC?
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post #6 of 11 (permalink) Old 03-21-2007, 12:17 AM
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No way, that isn't possible. We get about 19 highway, 13 city, and 10 towing

2001 Chevy SB/CC Duramax LB7

Garrett GT4088R from PPE, PPE Duel fuelers, PPE Tuning, PPE stage 4 transmission w/suncoast 1056 converter, PPE Lift pump, Fabtech tie rods, Black Eagle alloys.
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post #7 of 11 (permalink) Old 03-21-2007, 03:03 PM
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As Ross stated above, the crazy numbers displayed by the DIC when simple handheld tuners are used, do not portray accurate mpg numbers.

The DIC routine is reliant on the original stock fueling table, to remain accurate. All the handheld tuner manufacturers, change the fueling table. Some change just the WOT areas of the table, some change all sections. The ones that change just the WOT sections, can retain some DIC accuracy at part load/part throttle settings.

But for the most part, the manufacturers always lose DIC accuracy, and are not concerned, because the customer is fooled into thinking he has gotten a better deal than he really has. Smoke and mirrors by ommission. They don't tell you that you will get an 8 mpg improvement, they just let you discover it for yourself. You (unwittingly) become the manufacturers best sales tool, as exemplified in Post 4. Its a shame.

Economy benefits are possible with handhelds, but you will have to hand calculate the benefit. The DIC is unreliable. In my latest offering, I get 39-40 mpg on the highway (only because I created an all new fueling table). If I didn't change the DIC calibration table it would be a "miracle tune". I use a spreadsheet to correct the DIC, but EFILive is the only product that allows me to do this. Still, I can get a solid 22 mpg on the highway, not bad for an 8000 lb beast.

Don't be fooled, most handhelds provide little or no economy advantage, they all overboost at no-load fueling, and over retard timing for no load conditions.

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post #8 of 11 (permalink) Old 03-31-2007, 05:53 AM
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I get about 15 MPG city driving on 1 with my edge. Best highway I have had is 20.44

02 GMC 2500HD CrewCab 4x4
Green Metallic. Some cosmetic upgrades, MBRP 4" exhaust, Edge Juice w/Attitude, 20" Wolverines on 305/55/20 Nitto Terra Grapplers.
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post #9 of 11 (permalink) Old 05-02-2007, 12:42 AM
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I get about 18 mixed hand calculated, and I use the quadzilla on the 70hp tune. My tuner only boosts about a pound over stock, but my turbo does build boost much faster now. I like the quad alot

2004 Chevy CC/SB LB7 LT3
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post #10 of 11 (permalink) Old 05-02-2007, 11:00 PM
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Since installing the dsp5 to play with I have not had a chance to calculate fuel mileage for distance. Can't keep my foot out of it. :evil: With a tow tune I can get 17 around town.
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