Best Duramax year for mileage? - Chevy and GMC Duramax Diesel Forum
General Discussion General Diesel Discussion.

LinkBack Thread Tools Display Modes
post #1 of 30 (permalink) Old 04-06-2011, 08:44 AM Thread Starter
Join Date: Apr 2011
Posts: 3
Best Duramax year for mileage?

Good morning - I'm looking into purchasing a Duramax as my next truck. Was curious if anybody had any insight as to which year/configuration typically kicks out the best fuel mileage - 2002? 2006? LLY/LBZ? 5 speed/6 speed? etc.. I realize that the rear end ratio is also key (3.73 being better than a 4.10). From what I've heard and read, it sound like with the right combo, you can get in the mid 20's. I'd definitely prefer that over low teens! Any insight would certainly be helpful. Thanks!
FicksPlace is offline  
Sponsored Links
post #2 of 30 (permalink) Old 04-06-2011, 08:46 AM
DuramaxForum Enthusiast
SparkZ03DMAX's Avatar
Join Date: Dec 2008
Location: Western North Carolina
Posts: 4,018
Well my LB7 gets better miledge than my friend's LLY. We basically have the same stuff.

2001 Chevrolet LB7 Duramax
Some stuff. Thanks ATP trucks and Olee Poole

1980 Volkswagen Rabbit Pickup 1.5 Diesel 50mpg diesel sipper!!

Youtube Channel-
SparkZ03DMAX is offline  
post #3 of 30 (permalink) Old 04-06-2011, 08:52 AM
Hey Ass Man!
DAMAX's Avatar
Join Date: Feb 2009
Location: East Coast, Canada
Posts: 1,265
Mid 20's, probably not going to get there.. low 20's are doable.

08 GMC 2500HD LMM SLT CC SB 4x4
EFI Live DSP 5 w/ EDGE CTS Insight
PPE IV l Precision Torque Convertor
4" MBRP l MBRP DP l AD II 165
EGR Blocked l AFE l Zone 6"
Cognito UCA's l Kryptonite Sleeves
20x12 Fuel Octanes l 35x12.50 M/T's
DAMAX is offline  
post #4 of 30 (permalink) Old 04-06-2011, 08:55 AM
DuramaxForum Veteran
nickhare_21's Avatar
Join Date: Sep 2009
Location: IL
Posts: 1,236
get about 22 mpg highway when im trying to do good...but its soooooo hard!

11 Denali. Deleted.
nickhare_21 is offline  
post #5 of 30 (permalink) Old 04-06-2011, 09:52 AM
DuramaxForum Veteran
Georgia Duramax's Avatar
Join Date: Feb 2011
Location: Rome, GA
Posts: 1,625
I don't think I could get mid 20's if I put the truck in neutral and pushed off a cliff. Best I ever got was 22 MPG running stock tires (265/70R17) at 70 mph on cruise and not towing. I can consistantly get 18-19 mpg on the highway when changing speeds and about 15 mpg for in town. If you put your foot in it often, then don't expect that kind of mileage.


2008 GMC 2500HD LMM SLT CC SB 4x4 Z71
Buckstop front bumper, WARN M12000 winch, PIAA 520 ATP driving / PIAA 510 fog, Westin Platinum Series nerf bars, Pace Edwards Bedlocker tonneau cover, Cognito UCA leveling kit and HD Idler Pivot Assembly, Cognito Pitman and Idler steering braces, Bilstein 5100's, LT285/70R17 BFG AT KO tires, 17 x 9 XD Series Crank Wheels, 15% Tint Driver/Passenger windows, GM Tow Mirrors, DDM Tuning HID lights 6000K 35W
Georgia Duramax is offline  
post #6 of 30 (permalink) Old 04-06-2011, 09:58 AM
DuramaxForum Enthusiast
SteepyBS's Avatar
Join Date: Feb 2009
Location: Lake Forest Park, Washington
Posts: 3,140
stock 01-04 will be most fuel efficient but with a few mods youll be able to get just about any year to hit the same mileage, best real world mileage youre probably going to see is low 20s (personal best was 21.5 on 37s 70mph cruise control perfect driving conditions)

03 Chev CCLB
500HP on STOCK trans/fuel/turbo

built trans and lift pump coming soon!

special thanks to
SteepyBS is offline  
post #7 of 30 (permalink) Old 04-06-2011, 10:00 AM
Senior Member
lpslacker's Avatar
Join Date: Jul 2010
Location: Tampa, FL
Posts: 550
Im still toying with my tunes and cruising speed but ive done 21mpg with my LB7. Gotta be an old man though...

Originally Posted by flyinelvis11 View Post
yes! what is best in life? to crush your enemy, have them driven before you and to hear the lamentation of their women
2006 LBZ CCSB 8" fabtech lift, 37X13.50 Toyo MT,Zenetti 24x10 rims, S&B CAI, 5" straight pipe exhaust, 3" downpipe, EFI by Idaho Rob, Edge CTS Insight, mishimoto intercooler pipe

2001 mystic green Camaro Z28 6 speed, 408 forged stroker motor 505 rwhp 490tq
lpslacker is offline  
post #8 of 30 (permalink) Old 04-06-2011, 10:08 AM
saw what you did there
theunderlord's Avatar
Join Date: Jan 2009
Location: Seattle
Posts: 14,297
if you're concerned about MPG, a 7,000 pound truck might not be your best option.


Kevin: SOLD!!!!!!!!! MY07.5 3500HD SRW. LMM. LT. CCLB. 4x4.
8" Cognito, 20" SOTA'S, PPE Stage 5, SDP S475 Twin Turbo Over Stock, EFI Live by DuramaxTuner, ADII.
MY11 Volkswagen Golf TDI 6MT.
6K Lows, 3K Fogs, Tint.

theunderlord is offline  
post #9 of 30 (permalink) Old 04-06-2011, 10:10 AM
Senior Member
wvtork's Avatar
Join Date: Mar 2010
Location: morgantown wv
Posts: 528
personally the lb7 gets the best mileage of all of them Ive seen my lbz gets 13-18 and my buddys lmm gets 13 period but its bone stock

07 ecsb lbz lt3 edge 5'' to 7"black mitres ,stage 4 big dipper with 1058 sc, 4094 avnt, 45 over nozzles and atp ecm and dsp5 ,tb keys 325 cooper disc stts on 18 inch 197 EAGLES air dog II 165 ppe rail fitting and fprv shims and bushwhacker pockets
wvtork is offline  
post #10 of 30 (permalink) Old 04-06-2011, 10:10 AM
DuramaxForum Fanatic
DirtyMaxx03's Avatar
Join Date: Jun 2009
Location: Bulverde, TeXaS
Posts: 6,193
lb7's are better than everything! in every way!!

2003 Lb7 2wd
Efi Live by Rob Coddens
DirtyMaxx03 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome