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Old 06-14-2016, 11:10 PM   #21
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I use to never tow with cruise, but after catching myself going 79-80mph, (on a 75 mph turnpike, but staying with traffic) i had to start using it to keep my speeds down. Lol!!
Sometimes i wish i could set a limiter on my speed! My truck might actually have that option, but i haven't checked.

This is on a Gmc, Duramax 3500hd. Tow/haul always on and always left in drive .
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Old 06-14-2016, 11:13 PM   #22
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F250 diesel ~~~ set tow/haul, engine brake, and cruise at 65. Usually around 1600 rpm and 11.3 - 12.1 mpg. Down a steep grade just lower the speed control to a safe number.
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Old 06-14-2016, 11:29 PM   #23
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F250 diesel ~~~ set tow/haul, engine brake, and cruise at 65. Usually around 1600 rpm and 11.3 - 12.1 mpg. Down a steep grade just lower the speed control to a safe number.
I concur, the cruise control will actually take over going downhill and do the downshifting to maintain the set speed. Just make sure you set the speed lower as the cruise control overshoots before it slows to the set speed.

Personally, I will let the cruise control maintain speeds on hilly roads but not in the mtns, I want to be in charge there
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Old 06-14-2016, 11:36 PM   #24
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I concur, the cruise control will actually take over going downhill and do the downshifting to maintain the set speed. Just make sure you set the speed lower as the cruise control overshoots before it slows to the set speed.

Personally, I will let the cruise control maintain speeds on hilly roads but not in the mtns, I want to be in charge there

2 lane mtn roads means no cruise but interstate mountains let the cruise handle it, just set safe speed.
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Old 06-15-2016, 12:58 AM   #25
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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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x2. Just drove 950 miles like this. Worked perfectly. I also keep cruise in when going downhill, and the truck maintains a constant speed.

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Old 06-15-2016, 09:46 AM   #26
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I'll use cruise or I seem to always creep over faster than I want to go, between 63 and 65. If I don't use the cruise it seems I always end up creeping up to 70. The truck pulls very smoothly and it just happens.
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Old 06-15-2016, 09:51 AM   #27
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Tow/haul on, 6th gear locked out. Cruise when things are quiet in the interstate. '13 Duramax/Allison
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Old 06-15-2016, 10:24 AM   #28
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Read the tv manual. Many potential decision points. Today's electronic transmissions aren't what (I/we) grew up with.
My Tundra: tow haul engaged, lsd & anti sway disengaged, no cruise control. 60mph, 10.2 mpg over 1100 miles (NC to AL and back - over the "mtns" - US highway and Interstate mix) - 12,800 lbs combined weight
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Old 06-15-2016, 01:18 PM   #29
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my truck (2010 f150) wont let me lock out o/d gears. all I can do is put it into tow/haul. I wish I could lock out the o/d gears, because then I could use cruise control. it seems 65ish mph in 6th is right at that point it wants to shift a lot with even a hint of grade, so if I don't use cruise, I can better reduce the shifting. later years added 'select shift' which would sure be nice to have!


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Old 06-15-2016, 01:31 PM   #30
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I always use the TH mode when towing the TT. I do use the cruise when traveling on the interstate. I set it at 68 mph.
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