|11-08-2012, 02:00 PM||eBay Motors #1 (permalink)|
Join Date: Nov 2012
which gear is best for towing??
Heres the deal
2006 3500 single axil Duramax 4wd, extended cab, 8 ft bed, 63000 miles.
Was pulling my toy hauler (heavy) up the fla turnpike and tried a couple of things.
MFG readings from dash panel
numbers approximate but very close
held speed at 55 MPH on cruise
in 4th gear got 15 MPG @ 2200 RPM
in 5th gear got 13.5 MPG @ 1900 RPM
in 6th gear got 11.5 MPG @ 1650 RPM
I like the higher miliage but which is best for the drive train?
|11-08-2012, 02:31 PM||eBay Motors #3 (permalink)|
Join Date: Feb 2011
Location: Virginia Beach
I'm personally surprised at such high mileage in 4th and at that RPM.
2003 Chevy 2500HD D/A ECSB 206K
EFI Live, AD 150, Kryptonite tie-rods, MBRP 3" downpipe, MBRP 4" turbo back, batmowheel & BD wastegate, 33" BF Goodrich A/T KOs on H2s
Goals: Built trans and 4" lift, and maybe something about this turbo (again)
|11-08-2012, 02:34 PM||eBay Motors #4 (permalink)|
Join Date: Oct 2011
Hard to believe 15mpg at 2200rpm. Need to hand calculate
2007.5 Silverado 2500HD CCSB LTZ LMM
- 6" Fabtech - 35" Procomps - 17" Xd Spy's - Efi live by DDP - MBRP 5" with muffler and 6" tip - Resonator plugged
2011 Sierra 2500HD CCSB LML (Buisness vehicle) - 2.5" leveling kit, 35" micky Thompsons, 20" fuel boost rims - color matched cut out style flares
DMAXSTORE.COM, Your Duramax Diesel-Only Shopping Resource
|11-08-2012, 03:46 PM||eBay Motors #5 (permalink)|
Join Date: Jun 2011
Next time try you test with the tow haul engaged. Your rpms indicate you did not have tow haul engaged and the reason for the lower MPG's in the higher gears. Most likely when you were in 4th the torque converter may have been locked. But in 5 th and 6th it was not.
If it was your 5th gear rpm should have been 1562 and the 6th gear should have been 1342.
Last edited by lavarock; 11-08-2012 at 03:47 PM. Reason: spelling error
|11-08-2012, 04:07 PM||eBay Motors #6 (permalink)|
LHN...We ARE the Joneses
Join Date: May 2008
Location: Awww-stin, TX
Towin' heavy, higher RPMs, lower gear, less boost, lower EGT.
I show people again and again when we're on cruise and towing big/heavy; come down to 5th from 6th and it bumps from 17xx to 21xx or so and the DIC will just start clicking up by the tenths.
Never have messed around much in 4th, too slow.
2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air, Sulastics
Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
|11-08-2012, 04:40 PM||eBay Motors #7 (permalink)|
Join Date: Nov 2011
I just dont like to listen to all that noise. I like the truck as quite as possible. Personally when I pull I drive with my foot in M mode. Just hold steady on the throttle and downshift before the hills. I usually dont go over 60. It depends on the wind.
2010 Gmc 2500 Duramax over 490,000 Odometer miles
50% towing miles, Bridgestone Duravis R500 Tires,Counteract balancing beads, Rancho 9000 shocks, 89 Gallon RDS in box tank, 1 ton rear leaf springs, Curt 20k Fifth Wheel, Curt 18K Rear Mount hitch, Firestone ride-rite air bags, NUC Motorsports Bypass oil Filtration, Edge Insight CTS, Fass 95HD
|11-21-2012, 08:26 AM||eBay Motors #9 (permalink)|
Join Date: Jun 2010
Location: Coeur D'Alene Idaho
Im with everybody else tho. You cant trust the DIC numbers. Also to get accurate numbers you would have to make the same round trip each time.
I made a long road trip to utah and was getting anywhere from 13-21mpg depending on the terrain i was on. So the only way to check accurately what tune changes would do would be the very next day to run the same trip. because even outside temp can change it a lil bit