7 mpg towing kinda sucks....
04-01-2007, 06:59 PM
#16
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well i have 4:10's and im hauling anywhere from 20,000 to 25,000 lbs and im getting 9-11 mpg and truck only has 4k on it ,,i also have a 2006 and pulling the same weight i get no better than 9 mpg,,,i wish there would be a way to get better gas mileage
04-01-2007, 10:00 PM
#17
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yea get rid of the 4:10's the new truck gets about 7 to 8 with loads that are stacked about 8 ft high on the trailer so we have a square front of about 64 sqft, trailer weighs 8k by itsself, and we run 70 to 75. these newer trucks do seem to get a little bit better mileage with a chip. the 03 does get better mileage towing then the 07 but i believes its because of the g56 tranny that doent let it get in the 2 grand sweet spot like it needs to be at 70.
04-01-2007, 10:20 PM
#18
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What gears do you have? I have 4.10's and I don't have any issues at all with fuel mileage pulling heavy. My truck dosen't downshift either and always stays locked even if I lock out OD the TC will lock in 3rd. Hmmm?
Oh yeah, this has always been a common complaint with people pulling medium to heavy weight with 3.73's.
Oh yeah, this has always been a common complaint with people pulling medium to heavy weight with 3.73's.
04-01-2007, 11:10 PM
#19
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What gears do you have? I have 4.10's and I don't have any issues at all with fuel mileage pulling heavy. My truck dosen't downshift either and always stays locked even if I lock out OD the TC will lock in 3rd. Hmmm?
Oh yeah, this has always been a common complaint with people pulling medium to heavy weight with 3.73's.
Oh yeah, this has always been a common complaint with people pulling medium to heavy weight with 3.73's.
I have a manual transmission and 3.73 gears running with 255/70/22.5 and I am getting the best milage ever when pulling.
04-02-2007, 09:53 AM
#21
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04-02-2007, 10:14 PM
#23
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04-02-2007, 10:59 PM
#24
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Lost Lake it really sounds like something is really out of wack on your setup. I have towed my boat (#6500) to Kentucky & Lake of the Ozarks and worst was 11.8 mpg the best was 13.7 driving mostly 70-75. Hills were not even a little problem on tow/haul at the time and never searched gears like you described. My truck had about 10k miles then. I will assume you were using the tow/ haul and OD lockout correctly. What about the air & fuel fiters , I change the fuel every 15k and air when it looks dirty. The fancy thing for the air filter has never moved on mine. I have read where some folks lost their boost because of hose clamps comming off. What about your transmission level, is it ok? Your transmission could be slipping, have it checked out. Are you positive your trailer is pulling ok, brakes not dragging, axles not hot. Hope this gives you some places to look at.
I put it in Tow/Haul and leave it alone. I have the 3.73 rear end. The trans will unlock when it loses about 6mph on a hill, and that SOB will stay unlocked long after it hits cruise speed again, and for miles it will stay unlocked and running about 2300 rpm. The truck only has 5000 miles on it, I have syn in the diffs, dino in the engine, and haven't touched the fuel filter yet. Next week I'm putting 305's on it so this problem will get worse.
I'm thinking of a chip or tranny mod to fix this....
04-03-2007, 11:39 AM
#26
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I put it in Tow/Haul and leave it alone. I have the 3.73 rear end. The trans will unlock when it loses about 6mph on a hill, and that SOB will stay unlocked long after it hits cruise speed again, and for miles it will stay unlocked and running about 2300 rpm. The truck only has 5000 miles on it, I have syn in the diffs, dino in the engine, and haven't touched the fuel filter yet. Next week I'm putting 305's on it so this problem will get worse.
I'm thinking of a chip or tranny mod to fix this....
I'm thinking of a chip or tranny mod to fix this....
brett
04-03-2007, 02:58 PM
#27
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Tranny temps rise quick when it is unlocked. I have my Zilla Commander probe in the test port yet, but I have seen 173 degrees there.... I know it's higher than that at the fluid.
04-03-2007, 03:33 PM
#28
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your trans sould lock the converter in 3 rd after the down shift
but with the gn stock trailer its got to b3 about 7k empty mine dosent down shift even when i stand on it on the interstate
but with the gn stock trailer its got to b3 about 7k empty mine dosent down shift even when i stand on it on the interstate
04-03-2007, 03:36 PM
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I could have kept my gasser!! 90 gallons of fuel from Wisconsin to Mammoth Cave KY, and I have some left in the tank, but not much. The auto trans kicks down and stays unlocked for MILES and MILES and that really sucks down the fuel. I got better mileage running 73 because the trans can't unlock or it will redline. At 65 it unlocks at every hill and stays there until I give it a little more juice and then let off to lock it.
I think some type of trans chip or trans work is in the future.
7mpg pulling 10,000 lbs....
I think some type of trans chip or trans work is in the future.
7mpg pulling 10,000 lbs....
The mileage on my '06 is not what I expected. Maybe I should have bought a 6-speed manual? (I didn't want do all that shifting around town).
04-03-2007, 03:46 PM
#30
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I could have kept my gasser!! 90 gallons of fuel from Wisconsin to Mammoth Cave KY, and I have some left in the tank, but not much. The auto trans kicks down and stays unlocked for MILES and MILES and that really sucks down the fuel. I got better mileage running 73 because the trans can't unlock or it will redline. At 65 it unlocks at every hill and stays there until I give it a little more juice and then let off to lock it.
I think some type of trans chip or trans work is in the future.
7mpg pulling 10,000 lbs....
I think some type of trans chip or trans work is in the future.
7mpg pulling 10,000 lbs....
This past weekend when I went to Tulare with just the camper (no trailer) I got a solid 13.5 mpg. I weighed in at 9880 lbs when I started this past friday morning. And I might add, this trip was up the Cajon and Tehachapi Pass's