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Old 06-14-2016, 03:41 PM   #11
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I use tow/haul and cruise control all the time with od engaged.

2000 SIERRA 30 ft FKSS
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Old 06-14-2016, 04:21 PM   #12
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Check your owners manual, some vehicles lock out overdrive and some are Tow/Haul which minimize shifting engage engine brake on downhill situations. They are totally different and are used in different situations for different reasons.


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Old 06-14-2016, 04:21 PM   #13
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Tow/Haul button pressed

Manually lock out 7th and 8th

Cruise set to 65 mph

RPM around 2100 in 6th

10-12 MPG

Rarely shifts.

If I don't manually set 6th as max gear it will happily go to 8th even in tow/haul mode and shift frequently between 6th, 7th and 8th and the "ECO" light pops on lol
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Old 06-14-2016, 04:41 PM   #14
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Tow/Haul on, cruise set for 60, runs about 1500rpm, 11mpg on flat/hilly. Always leave 6th gear in place. Mtns more manual mode. F250, diesel.
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Old 06-14-2016, 04:50 PM   #15
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Tow Haul Mode

In my owners manual on my dodge Ram 1500 it says to only use tow Haul when taking off or in hilly terrain My TT only weighs 4750 I never use Tow Haul
But I do use cruise Control getting 10 to 11 MPG
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Old 06-14-2016, 04:54 PM   #16
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I have a 12 Silverado 3500 SRW diesel, I run in tow/haul, set the exhaust brake and once truck gets to 63 I set the cruise. Up a steep mountain I set the speed lower. I just keep truck between the lines. I can hardly wait until self driving vehicles come out

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Old 06-14-2016, 05:19 PM   #17
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We started out using tow/haul but not cruise. Later when we got used to our truck we use cruise all the time except steep downhills when we use manual mode.

You should do whatever you and your tow vehicle are comfortable with.
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Old 06-14-2016, 05:43 PM   #18
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Originally Posted by MKClark View Post
First I put it in the trailer/haul mode. Then set cruise at 65 mph and let the truck do it's thing. Does great in the rolling hills of Texas.
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2014 Chevy 1/2 ton 5.3/3.42

Exactly the same here.

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Old 06-14-2016, 05:44 PM   #19
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I have a Sierra with the 6.0 liter Vortec. I usually use tow mode but if the terrain is reasonably flat for an extend period I take tow mode off. It drops my rpm to 1850 (at 60 mph) from just over 2000. I'm assuming there would be some economy involved there.
I never engage cruise control. Too much shifting and therefore harder on the tranny.
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Old 06-14-2016, 05:49 PM   #20
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We have a Chevy 2500HD Duramax/Allison pulling 10,000+ lb TT. I always leave it in DR with the exhaust brake turned on and the cruise control on. The Allison tranny figures out what it needs. In the mountains, the cruise control will do all the gearing down necessary for the downhill runs. If it goes above 3,800 rpms, I might add a little breaking [exhaust] but rarely had to. To us, the Allison tranny is worth everything in towing.

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