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Old 06-13-2010, 03:50 PM   eBay Motors  #1 (permalink)
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Question Lb7 mpg

I have an 04 LB7, i bought the banks sitnger system came with exhaust, tuner, air box and wastegate actuator. Im getting 15 to 16mpg around town not driving crazy or pulling any wieght, what can i do to get better fuel economy? It might all be bs but i have talked to people with the same rig as me and they are saying the get 19 to 23 mpg town/freeway.
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Banks Economind tuner (Powerpack upgrade for 100hp & 230 lb-ft)
Banks Ram air intake
Banks Monster exhaust
Banks Big Head Wastegate actuator
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Old 06-13-2010, 03:54 PM   eBay Motors  #2 (permalink)
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Well first of all, welcome to the forum!!! Is that hand calculated? The dash will lie sometimes and say you are getting better/worse than you really are. Second, when did you last change your fuel filter? Third, run some 2 stroke oil in at every fill up, its getting me better mpg
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SOLD:2002 CC/SB Duramax LS 4x4 LB7, Solid axle conversion, 14" lift, 20" XD Diesels (black), 39.5x16.5x20 Pitbull Rocker M/Ts, ATS E-power 160HP/360TQ Tune, Edge Attitude Moniter for Guages, Amsoil Custom Intake, PPE Boost Valve, Custom 5" Straight pipe, Limo Tint everywhere, HID 8k heads, Clarion 7" flip out, (2) 10" subs
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Old 06-13-2010, 03:59 PM   eBay Motors  #3 (permalink)
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Welcome to the forum.

I would say 19-23 is a bit of a stretch probably.

As was already mentioned, check your maintenance, oil, fuel filter, tranny fluid and filter.

What mods do you have?

When my truck was stock I got about 15.5 mpg. I cut out the muffler and went straight pipe, and I did the Kennedy air box mod. I think both helped.

Now I have a programmer set to +65 hp and have seen my mileage about 17.5 mpg.
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Old 06-13-2010, 03:59 PM   eBay Motors  #4 (permalink)
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Thanks, Yes its hand calculated the dash is usually 1 to 2 mpg off. I just changed the fuel filter two weeks ago along with the water seperator. Are you saying put some 2 stroke oil in the fuel? if so how much shoud i put in, thats not going to mess anything up internally?
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04 LB7 4x4 SLT crew cab short bed
Banks Economind tuner (Powerpack upgrade for 100hp & 230 lb-ft)
Banks Ram air intake
Banks Monster exhaust
Banks Big Head Wastegate actuator
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Old 06-13-2010, 04:02 PM   eBay Motors  #5 (permalink)
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the only mods i have are the exhaust, intake and banks tuner
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04 LB7 4x4 SLT crew cab short bed
Banks Economind tuner (Powerpack upgrade for 100hp & 230 lb-ft)
Banks Ram air intake
Banks Monster exhaust
Banks Big Head Wastegate actuator
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Old 06-13-2010, 04:02 PM   eBay Motors  #6 (permalink)
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Quote:
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Thanks, Yes its hand calculated the dash is usually 1 to 2 mpg off. I just changed the fuel filter two weeks ago along with the water seperator. Are you saying put some 2 stroke oil in the fuel? if so how much shoud i put in, thats not going to mess anything up internally?
Nope it won't hurt a bit, it will actually help lubricate. Many members here do it, along with big rig drivers. Just go to wal-mart and buy TCW-3 rated 2 stroke oil, I buy 16 oz. bottles at a time, and use half of that at every fill up. So 1 bottle lasts me 2 tanks. And the 16 oz. runs maybe $3.
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SOLD:2002 CC/SB Duramax LS 4x4 LB7, Solid axle conversion, 14" lift, 20" XD Diesels (black), 39.5x16.5x20 Pitbull Rocker M/Ts, ATS E-power 160HP/360TQ Tune, Edge Attitude Moniter for Guages, Amsoil Custom Intake, PPE Boost Valve, Custom 5" Straight pipe, Limo Tint everywhere, HID 8k heads, Clarion 7" flip out, (2) 10" subs
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Old 06-13-2010, 04:04 PM   eBay Motors  #7 (permalink)
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I get anywhere from 14-24 depending on terrain and driving habits
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Old 06-14-2010, 07:05 AM   eBay Motors  #8 (permalink)
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Used to get 17 mpg on a good day stock. Now with EGR deleted, Kennedy air box mod, banks exhaust turbo back, EFI live tuning by Idaho Rob, 5 to 6 speed tranny conversion (about 1mpg increase average), intake horn mod, stock tire size, nicktane prefilter, and lift pump, I can now get 20-21 where I could only get 17-18 before.
As far as 2-cycle oil is concerned, I never ran it with my first set of injectors...only some stanadyne...and got 112K miles out of them. On the 2nd set I ran 2 cycle oil in every tank and only got 56K out of them. For the 3rd set I am not running any 2 cycle oil but running stanadyne in every tank. Personally I think running 2cycle oil, at least for me, was a waste of money and time and seemingly did nothing to extend the life of my injectors. The truck currently has never run so well.
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Old 06-14-2010, 09:35 AM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by audiomixer View Post
Used to get 17 mpg on a good day stock. Now with EGR deleted, Kennedy air box mod, banks exhaust turbo back, EFI live tuning by Idaho Rob, 5 to 6 speed tranny conversion (about 1mpg increase average), intake horn mod, stock tire size, nicktane prefilter, and lift pump, I can now get 20-21 where I could only get 17-18 before.
As far as 2-cycle oil is concerned, I never ran it with my first set of injectors...only some stanadyne...and got 112K miles out of them. On the 2nd set I ran 2 cycle oil in every tank and only got 56K out of them. For the 3rd set I am not running any 2 cycle oil but running stanadyne in every tank. Personally I think running 2cycle oil, at least for me, was a waste of money and time and seemingly did nothing to extend the life of my injectors. The truck currently has never run so well.
Its a hit or miss. Basically its just what you prefer. With my old 01 I used Power Service and liked it. This 02 Im using 2 stroke oil and it seems to be getting me better mpg. Alot of factors go into this though, my tires are completely different and a little smaller, this truck has less miles, etc.
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CURRENT: 2006 Silverado 2500HD 4x4 crew cab (black), 20" chrome Diamo 16 Karat wheels wrapped with 33x11.5 Cooper Discoverer ATPs, 2" wheel spacers, custom straight pipe exhaust, PPEI dsp5 tuned by Kory, 8k HIDs in head/foglights, Limo tint, more coming soon...

SOLD:2002 CC/SB Duramax LS 4x4 LB7, Solid axle conversion, 14" lift, 20" XD Diesels (black), 39.5x16.5x20 Pitbull Rocker M/Ts, ATS E-power 160HP/360TQ Tune, Edge Attitude Moniter for Guages, Amsoil Custom Intake, PPE Boost Valve, Custom 5" Straight pipe, Limo Tint everywhere, HID 8k heads, Clarion 7" flip out, (2) 10" subs
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Old 06-14-2010, 09:44 AM   eBay Motors  #10 (permalink)
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My old LB7 had no problem hitting 23 mpg, if it was all highway. No way mine would have hit a 23 average city/highway. Easy acceleration, and driving at about 69-70 mph was about perfect for me. Once stop and go traffic was added to the mix, I would average more like 17 mpg or so. All hand calculated.
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