Upgrades to improve MPG? - Chevy and GMC Duramax Diesel Forum
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Old 01-16-2012, 01:40 PM   eBay Motors  #1 (permalink)
 
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Upgrades to improve MPG?

Hey everybody I need some help, just bought an 06 duramax (first gm diesel) and I am getting horrible mpg. On my last tank of fuel I got 227 miles before the empty light came on. Im using winter diesel right now which doesn't help as well as the lift and tires but I used to own a cummins and it is a night and day difference.

The truck is stock performance wise, so before I buy anything for it im wondering what stuff I should buy first to increase mpgs (what programmers work best, any underhood stuff that will help) Turbo back exhaust will be the first thing I would asume. All my buddys that drive dmax trucks tell me to EFI live it, I am under the impression that it is more of a go fast tune rather than a fuel saving tune.

So if you guys could point me in the right direction to get better mpg that would be great!
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Old 01-16-2012, 01:48 PM   eBay Motors  #2 (permalink)
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EFI Live tuning can be geared toward whatever you want. A good EFI Live tune will yield better mileage than anything else.

Tuning and a free flowing exhaust will gain you a easy 2-4 mpg. If you have any questions please let me know.

Tyler
MPF
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Old 01-16-2012, 01:49 PM   eBay Motors  #3 (permalink)
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is your speedo reading correctly??
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Old 01-16-2012, 07:28 PM   eBay Motors  #4 (permalink)
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Quote:
Originally Posted by imcasc8 View Post
is your speedo reading correctly??
^^ what he said ^^
Your signature indicates a lift and bigger tires. If you haven't recalibrated/programmed the puter then the #'s are gonna be off.
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Performance EFI LIVE DSP5 Idaho Rob's Magic, ADII 165 lift pump, 5in flo-pro exhaust, ADP DP, Transgo Jr. shift kit & Transynd swap, Autometer Boost and Pyro Guages, EGR BLOCK, PCV reroute, resonator cap, PPE Airbox MOD
Suspension Tuff Country 6" with Moog TieRods, Billsteins, 20in Helo, MT FCII 35's, Cognito full travel air bags w/Firestone Air Rite controls
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Appearance.....just because Linex Bedliner, billet grill, Wheel-to-wheel nerf bars, AstroStart, HIDs "all on", Denali Door Handles, Colormatch visors and bugsheild
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Old 01-17-2012, 06:21 AM   eBay Motors  #5 (permalink)
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I also am wondering about what the mileage should be. I recently went on a trip and was getting 16.5 mpg at 70 mph I have 285s on it and the front end leveled other than that I'm stock. I am running stanadyne if that makes any difference?
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Old 01-17-2012, 06:35 AM   eBay Motors  #6 (permalink)
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When my lbz was stock besides the lift and tires. I would get 400 miles to a tank
EFI and my upgrades I get a little more nothing to brag about
Speedometer still off on mine too
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Old 01-17-2012, 06:37 AM   eBay Motors  #7 (permalink)
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227 to a tank? something is not right....you should be getting AT LEAST 100-150 more miles per tank
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Old 01-17-2012, 07:26 AM   eBay Motors  #8 (permalink)
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Thanksgiving 2011 made a trip and got 19.96mpg hand calculated with my mods. About 50/50 highway speed ( 62-ish) and interstate (73-ish). The right foot has a lot of influence on the mpg
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Old 01-17-2012, 03:17 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by Grimace View Post
Hey everybody I need some help, just bought an 06 duramax (first gm diesel) and I am getting horrible mpg. On my last tank of fuel I got 227 miles before the empty light came on. Im using winter diesel right now which doesn't help as well as the lift and tires but I used to own a cummins and it is a night and day difference.

The truck is stock performance wise, so before I buy anything for it im wondering what stuff I should buy first to increase mpgs (what programmers work best, any underhood stuff that will help) Turbo back exhaust will be the first thing I would asume. All my buddys that drive dmax trucks tell me to EFI live it, I am under the impression that it is more of a go fast tune rather than a fuel saving tune.

So if you guys could point me in the right direction to get better mpg that would be great!
-Mod the intake
-Exhaust
-ECM Tuning. (EFIlive or PPE)

Also, try Walmart 2 Stroke oil in the fuel at a rate of 1oz per gallon.
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07' Chevy Silverado HD
--CC, SB 4X4 Duramax Diesel/ 6 spd Allison Auto (PTO high idle mod)
--EFILive by KB3MMX Tuning W/ SDP Towing Twins (Billet S475 over Stock)
--SILVERLINE 4" Stainless Exhaust
--AMSOIL Synthetics and filtration bumper to bumper, including Bypass
--DDM tuning HID's in Low and High Beams, 6000K Lows/4250K Highs
--PPE rear Diff cover, PPE Deep Trans Pan, PPE High Flow Manifolds and Up Pipes
--Danville 3" Y Bridge and big air intake kit / EGR delete
--Airdog II DF200 w/ CAT UHE filter upgrade...etc,etc...
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Old 01-17-2012, 03:24 PM   eBay Motors  #10 (permalink)
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Also these lights like to come on pretty early (like at 18 gallons)so just keep an eye on the fuel used it is usually within a tenth or 2. These trucks have a 26 gallon tank so I usually run mine down to about 22-23.
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2007 LBZ CC/SB SLT 4x4, 5" Magnaflow SS, S&B CIA, Firestone Airbags, Dominator III steps, De-Badged, 5% on windows with 40% on windshield, 5K HID's w/ All-On-Mod, Edge CTS Insight, SDP EGR delete w/ boost probe, Batmowheel, ATP tunes, PCV reroute w/ plug, Kryptonite Tierods & Centerlink, Cognito UCA's, Bilstien 5100's, Airdog II 165, ATP Intercooler pipe, Pump rub upgrade and Transfer case brace, Trans repair lines, LML manifold, SS brake lines, Sulastic springs, ATS pans, ATI dampner, drilled and slotted rotors with ceramic pads, 295/70-17 Trail Grapplers on H2's

Thanks Dustin and Rob at ATP and Steve and Zack at Glissions Diesel Performance
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