Duramax MPG
10-25-2015 | 01:36 AM
#11
Registered
Joined: Dec 2009
Posts: 711
Likes: 37
From: Florence, Kentucky
My 2008 Southern Comfort Conversion with 35 x 20 Toyos got 7-9 towing and 11-12 empty in stock form. I deleted the DPF, blocked the EGR, added a MPRP down pipe and exhaust, EFI Live tuning with the CTS monitor and got it up to where my 05 Duramax was stock. 11-12 towing, 15 - 16 empty.
Last edited by Sunny32SSR; 10-25-2015 at 07:55 AM.
10-25-2015 | 01:47 AM
#12
Registered
Joined: Aug 2005
Posts: 6,306
Likes: 1
From: Between A Womans Leggs in IL
i used a friends 04 standard cab 4x43.73 gears 285 75 16 tires and the speedo was off 5 mpg with those tires.. ran from chicago to loto and back..hand calculated 21 mpg at 70 mph..with the speedo being off it got more mpg but the speedo rir not show the extra mpg because the speedo was a little off from the bigger tires..
10-25-2015 | 05:55 AM
#13
Registered
Joined: Dec 2005
Posts: 448
Likes: 6
From: Raystown Lake Pa
10-25-2015 | 06:09 AM
#14
Registered
Joined: Dec 2005
Posts: 448
Likes: 6
From: Raystown Lake Pa
i used a friends 04 standard cab 4x43.73 gears 285 75 16 tires and the speedo was off 5 mpg with those tires.. ran from chicago to loto and back..hand calculated 21 mpg at 70 mph..with the speedo being off it got more mpg but the speedo rir not show the extra mpg because the speedo was a little off from the bigger tires..
10-25-2015 | 06:30 AM
#15
Registered
Joined: Jul 2009
Posts: 1,407
Likes: 3
From: Bay City, MI
05 Crew LLY, egr delete, cat delete, turbo mouthpiece, EFI live tunes by ATP, stock tires and gear. Gets 15-16 daily driving, 11 towing heavy. Highway MPG is directly related to speed/RPM, 16 at 80 but will pull 20 or better at 65.
10-25-2015 | 03:58 PM
#16
Registered
Joined: Mar 2013
Posts: 140
Likes: 0
From: Connecticut
05 extra cab short bed. Intake, turbo mouth piece, straight piped, EGR block, lift pump, and PPE program at level 1. 15ish around town with some highway. 17 highway only and anywhere from 10-12 towing depending on how i drive. If i go up to level 3 the mileage goes up also...
10-25-2015 | 06:49 PM
#18
Forum Regulator
Joined: May 2001
Posts: 24,211
Likes: 1,608
From: Worldwide
From another thread; applicable here:
And a LOT can affect fuel mileage, so trying to do any comparison is pointless.
gearing
cab size (standard/extended/crew/mega)
bed size (short/long/flat/none/custom)
drw vs. srw
4x4 vs. 2WD
fat wife vs. skinny gf
empty vs. a few tools vs. fully loaded
towing mirrors vs. regular mirrors
windows down vs, AC on
bug deflectors
tire size (height)
wheel size (diameter)
tire size (width)
wheel size (width)
windshield visor
tonneau cover vs. open bed vs. cap vs. van body
lift vs. stock vs. lowered
Manual Transmission vs. Automatic Transmission
How many Transmission gears? 4, 5, 6. more?
Driving Style (biggest variable)
gearing
cab size (standard/extended/crew/mega)
bed size (short/long/flat/none/custom)
drw vs. srw
4x4 vs. 2WD
fat wife vs. skinny gf
empty vs. a few tools vs. fully loaded
towing mirrors vs. regular mirrors
windows down vs, AC on
bug deflectors
tire size (height)
wheel size (diameter)
tire size (width)
wheel size (width)
windshield visor
tonneau cover vs. open bed vs. cap vs. van body
lift vs. stock vs. lowered
Manual Transmission vs. Automatic Transmission
How many Transmission gears? 4, 5, 6. more?
Driving Style (biggest variable)
Last edited by Sydwayz; 10-25-2015 at 06:51 PM.
10-25-2015 | 07:26 PM
#19
Registered
Joined: Sep 2013
Posts: 1,652
Likes: 390
From: Syracuse Ny
ive never seen better than 10 towing with my 08 3500. BUT, but friends with 05 cummins. one friend has built motor, huge injectors,built tranny, 40'' tires, 10'' lift and hand calculated gets 24mpg highway running 80.... alot of it is in the custom tuning and making everything run in sync... but ya, ive never owned anything that gets 19 or so towing.
