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Old 01-21-2014, 04:40 PM   #1
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Figuring out best cruising speed

Hoping you guys may give me some insight into figuring out my most efficient cruising speed.
I have a '14 GMC 2500hd with the Duramax and 3.73 gears. It's a crew cab and will mostly be occupied with about 450 lbs of humans and another 200+\- cargo. My trailer is a 3150bhd weighing at about 10k max.
Is there anyone out there with a similar set-up? Going to be mainly highway on the east coast, and PA can get pretty hilly, so I'll try and make up for that on the straights.
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Old 01-21-2014, 05:03 PM   #2
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I told the boys when I taught them to drive a stick the car will tell you when to shift....... I go by the same idea with speed pulling the trailer..... the truck kind of determines how fast but I rarely go over 65. I just go with what ever the MPGs are............ and don't worry about that.
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Old 01-21-2014, 08:29 PM   #3
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65 MPH works for me in most open highway flat situations.



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Old 01-21-2014, 08:38 PM   #4
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No more than 65. Your Duramax will be in it's peak torque at just under 65.
Also, after 65 the wind resistance really kicks in and will effect you fuel mileage.
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Old 01-21-2014, 08:46 PM   #5
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We like 62 mph on the open road, good for mpg plus most trailer tires are only rated for 65 mph.
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Old 01-21-2014, 09:45 PM   #6
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Quote:
Originally Posted by Sirsea View Post
We like 62 mph on the open road, good for mpg plus most trailer tires are only rated for 65 mph.
Same here.
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Old 01-22-2014, 06:13 AM   #7
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My truck really likes 70-72. Like others said, your tires on your trailer are rated at 65.
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Old 01-22-2014, 07:07 AM   #8
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My 5er is around 14k and it likes 67-68mph. Anything less (62-65), and it feels like it's wanting to downshift, and occasionally does. Each trailer and setup has it's own "sweet spot", just need to find yours.
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Old 01-22-2014, 07:12 AM   #9
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I run at 65 mph. It's in cruise and not in tow haul. I do use tow/haul for braking along with the engine braking. We travel across the top of the U.S. going out to western Canada and back the same way. In the foothills of the mountains and just about on any hilly roads we are in cruise and the duramax handles it great. Barely notice when it downshifts to 5th. I have a 2011, 1ton dually, crew cab, long box, 4x4. I use tow haul mode when merging back onto the highway to get up to speed. I've had 2 trucks with the duramax engine. The 1st one was a 2001 3/4 ton and I travelled at the same speed with that one but there is a ton of difference with the newer one. More HP for one. My 5er is 35 ft and when packed for camping and/or traveling out west the total weight for both vehicles is around 23,900 lbs. My tires all around are at 80 psi.
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Old 01-22-2014, 07:25 AM   #10
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I run at 65 mph. It's in cruise and not in tow haul. I do use tow/haul for braking along with the engine braking. We travel across the top of the U.S. going out to western Canada and back the same way. In the foothills of the mountains and just about on any hilly roads we are in cruise and the duramax handles it great. Barely notice when it downshifts to 5th. I have a 2011, 1ton dually, crew cab, long box, 4x4. I use tow haul mode when merging back onto the highway to get up to speed. I've had 2 trucks with the duramax engine. The 1st one was a 2001 3/4 ton and I travelled at the same speed with that one but there is a ton of difference with the newer one. More HP for one. My 5er is 35 ft and when packed for camping and/or traveling out west the total weight for both vehicles is around 23,900 lbs. My tires all around are at 80 psi.

I've always heard you should use tow/haul mode when towing heavy. It provides engine braking and changes the trans shift points. Don't know for sure but was told you can tear up a tranny if you don't when towing heavy. Anyone else know what's correct?? Aside from that I run about 68 mph towing a 12k fiver!
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