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Old 10-06-2011, 05:20 PM   #15
CLOUDSPLITTER "Tahawas"
 
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Originally Posted by nswhite View Post
Way back when you could not use OD and tow. Modern transmissions are far better. I have a 2005 Suburban and use D whenever practical (mostly flat terrain). Turn on Tow/Haul when needed. Using D saves on gas.

Me too...keeping an eye on the tranny temp gauge.

Bob
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Old 10-06-2011, 07:20 PM   #16
Flying Cloud STEVE
 
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This question has me wanting to try NOT using the Tow Haul button, at least not on the flats, anything to get a bit better mileage. I'm pulling a 25' with a Tundra and in Tow Haul have to look to even know it is back there, but you can tell at the gas pump!!
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Old 10-06-2011, 07:51 PM   #17
CLOUDSPLITTER "Tahawas"
 
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Steve,

Notice that I tow with an 8.1 Burb, and only use drive on the flats.
It's a computer controlled transmission with a limp-mode (speed restricted), that will kick in when the tranny gets too hot. So it's almost impossible for it to leave you completely stranded.....almost.

I know nothing about the Toyota drivetrain, check with your fellow Toy-drivers.
Be sure, be safe.

Bob
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Old 10-06-2011, 08:16 PM   #18
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Laurel , Montana
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I have an Ecoboost also, with only a 19' Bambi. Don't need TH for only 4500 lbs, even in the mountains of Montana. Really like this TV.
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Old 10-06-2011, 09:28 PM   #19
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This week I took my first RV trip with my 2012 Jeep Grand Cherokee Overland 5.7l V8. It has the new 6 speed transmission. I have the 20' Argosy with me, about 4200# as loaded... in Tow/haul, the shifts are more solid, and going downhill is great as it downshifts automatically to reduce breaking. Using the fuel meter built into the rig, the mpg seems to be better in tow/haul than in Drive... So far it seems to be running about 13.2 mpg towing, lots of mountain grades in western Montana, up Glacier Park area.
We just did California to Montana and back with our 2011 Jeep Grand Cherokee Overland 5.7l V8 (essentially identical to the 2012 Jeep GC) and used Tow/Haul the entire time for our 2002 19' Bambi (4500 pounds loaded). Our mileage, using the computerized fuel meter, was the same as idroba's. Shifts in Tow/Haul were perfect, with downshifting for downhill, and there was no searching. Seems like Jeep has done a good job with the Tow/Haul mode.

Tim
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Old 10-06-2011, 10:04 PM   #20
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We tow our 28' Safari with our new Silverado 6 speed. It does occassionally go into 6th gear in tow mode on the flats but normally 5th. I have towed without it and it does fine where there are no big hills and we get a little better mileage. The last trip coming back from to UP we got 12.9 mpg. About half that distance was not in tow mode. We really like the 6 speed, tow mode or not.
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Old 10-06-2011, 10:09 PM   #21
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how many pounds can you tow with the new grand cherokee with the hemi!!!?? great looking vehicle !! Jeep has a winner from all I read on the 2011 2012 jeep cherokee
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Old 10-06-2011, 10:45 PM   #22
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Back when I was a bit less smart, I rarely used the tow/haul mode on our Dodge Quad Cab Hemi (towing 3,000 lbs of motorcycle trailer at excessive speeds). It did seem to provide better gas mileage.

My bad habits carried over to towing our 25' Airstream, and I got the "wakeup call".......transmission failure!! The only saving grace was having 1,100 miles left on the power train warranty.

My habits have improved.....slower speeds and always using the tow/haul mode.

Chief
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Old 10-06-2011, 11:25 PM   #23
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how many pounds can you tow with the new grand cherokee with the hemi!!!?? great looking vehicle !! Jeep has a winner from all I read on the 2011 2012 jeep cherokee
7300# tow rating with the 5.7L hemi. 5000# with the Pentastar V6.

The change in the 2012 5.7L is the new 6 speed automatic.

It seems like it is a great rig. However, I have not sorted out the automatic leveling vs. the proper spring bar setup. But even so, it is a very impressive vehicle in all ways. The backup camera is great for hitching up. Tonight, it is 40 here in NW Montana, and I tried starting the engine with the remote start feature. It even turned on the heated steering wheel, automatically, and the wheel was all toasty warm when I drove off. The seats are not only heated in both the front and back, but the fronts have two speed cooling mode for hot weather. Wow!
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Old 10-06-2011, 11:53 PM   #24
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The Toyota 6 speed tranny does not care whether you are in t/h or not- the transmission still downshifts when you tap on the brakes and are going downhill. This is one of the reasons that I forget to put it in t/h when I am in hilly terrain.

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Old 10-13-2011, 09:22 PM   #25
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Tow and haul is recommended in the owners manual of my new F-250 6.7 diesel with 6 speed auto transmission. I enables the transmission to run cooler according to the book.
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Old 10-13-2011, 09:39 PM   #26
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My diesel SuperDuty when in tow/haul revs higher when shifting up and downshifts earlier when on a hill or when you step on the gas. I don't see why anyone would manually keep the transmission in 3rd. It would seem the engine would be turning really fast at highway speeds.
The engine might be turning faster, but IMO (and I have always been told) it's better for the engine to run at a slightly higher RPM then having the engine struggle at 2000 - 3000 RPM. I have a manual and have towed a lot of various equipment (no haul mode;-) If it's flat and I'm doing 70 I certainly will be in 5th, but going up steeper grades I'll give it plenty of RPMs. Have taken my tacoma back and forth across the US several times towing various things (cars, trailers) and both tranny and engine seem to be in good shape.
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Old 10-14-2011, 05:58 AM   #27
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Shawn, I have a 25, but tow with a 2010 Tundra. This past weekend towing up to Ok. I played a bit with the tow/haul on the flats and could notice little difference, but the Tundra's computer constantly showed that I was getting better mileage with the Tow/haul. I averaged 13 mpg for the weekend but I drive like your grandma.

STEVE
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Old 10-14-2011, 06:58 AM   #28
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use t/h every time when towing.diesel engine braking and different shift patterns make the truck feel more in control of the trailer.overdrive kicks in around 65 mpg for highway driving.plus manual says that the cooling of the trans is increased in t/h.
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