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Old 02-07-2020, 06:51 PM   #61
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I've seen others that claim better. However, my particular truck always right around 14.. sometimes 15-16 if not towing. I've heard claims of 20 but personally, I've never seen that.

Beats the daylights out of my Esky.. 6-7 mpg stopping every 2 hours for gas.
That's interesting. We get 19.6 when not towing with most of our driving on NC mountain roads.

Our cruising speed is usually 5mph under posted limit but never over 65. We can usually find a big rig to follow doing the same.
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Old 02-07-2020, 07:22 PM   #62
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On the interstates, I wait for a semi doing 65 or a little less by going a little slower than that. I let it pass, set the adaptive cruise, and settle in for the ride.
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Old 02-07-2020, 07:35 PM   #63
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Yep, semi drivers love it when you do that. They call folks who do that Klingons or dingle berries
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On the interstates, I wait for a semi doing 65 or a little less by going a little slower than that. I let it pass, set the adaptive cruise, and settle in for the ride.
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Old 02-07-2020, 07:44 PM   #64
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Yep, semi drivers love it when you do that. They call folks who do that Klingons or dingle berries
But with adaptive cruise set at max following distance, I'm not drafting them... I've never been one who stays under 20 feet from their back bumper.
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Old 02-07-2020, 07:45 PM   #65
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That's interesting. We get 19.6 when not towing with most of our driving on NC mountain roads.

Our cruising speed is usually 5mph under posted limit but never over 65. We can usually find a big rig to follow doing the same.
Probably depends on the vehicle. What are you driving?

Mines a Dually so that'll make a difference too..
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Old 02-07-2020, 08:12 PM   #66
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My CGVW is generally around 23,500-24,000 lbs. When we first got the 5er I could easily travel the 70-75 mph. Lately I use cruise control to run at 64-67 mph and try to keep that semi traveling around the same speed about 1/4 of mile out front, just to know I'm maintaining a reasonable speed. Though I will pass them going up hills while maintaining that 64-67 on cruise control. If I find that I am creeping up on a semi and don't want to drastically fall behind them (especially on 2 lane) I will kick up cruise control 1-2 mph, pass them and then kick it back down when a good distance out in front of them.

Oh - right hand lane unless on 3 plus lane road (one way) then I will tend to float to a more middle lane. Also average 10.5-11.0 mpg towing and 16-20 when not.
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Old 02-07-2020, 11:23 PM   #67
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But with adaptive cruise set at max following distance, I'm not drafting them... I've never been one who stays under 20 feet from their back bumper.
I love adaptive cruise control. I wouldn't buy a truck/car without it.

I worked at GM back in the 80's on adaptive cruise control and collision avoidance. Imagine my surprise when I went to order a GM truck in 2018 and they didn't offer it unless you bought a suburban or Tahoe. Was one of the reasons I bought a Ford.
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Old 02-08-2020, 01:13 AM   #68
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About 62-65
i -70 utah is 80 mph
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Old 02-08-2020, 01:17 AM   #69
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i -70 utah is 80 mph
Pretty sure the trailer speed limit in Utah is 65 mph.
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Old 02-08-2020, 04:08 AM   #70
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I like 65-68mph. Cruise usually set at 68 on flats and may tap the accelerator to get to 70mph at the base of a long hill to give me a little more of a runup into my maximum HP @5200rpm/Torque@ 4000 RPM range.
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Old 02-08-2020, 05:11 AM   #71
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New England based and never in a hurry. 62-65 works for me
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Old 02-08-2020, 05:43 AM   #72
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65-67 ..... sweet spot .... brought the S Class home Thursday and winds were gusting 35-45 I took back roads and stayed 55mph .... head wind was so strong the 6.7 Cummins actually downshifted once first time it has done that.... 3 hour drive took 5
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Old 02-08-2020, 01:31 PM   #73
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Pretty sure the trailer speed limit in Utah is 65 mph.
Actually it's the same as for passenger cars unless specifically posted lower.

https://drivinglaws.aaa.com/tag/trailer-speed-limits/

The above link is from AAA and lists towing speeds for all states as well as Canada. Might be a good idea to read and drive accordingly in the states you pass through. Might run into a bored LEO who now has legal justification to conduct a traffic stop if you are speeding. Some states have a pretty low "towing speed limit".

Take note of Arizona's law. It doesn't state a specific speed, just "Vehicles towing trailers or semitrailers may not exceed a rate of speed that causes lateral sway."
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Old 02-08-2020, 04:12 PM   #74
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Now that was hysterical! NJ, biggest nanny state I've ever lived in, has no special towing restrictions. Son of a gun. I can finally brag that my state has allowed common sense to prevail. For this one thing. Please don't publicize this, or my do-nothing but aggravate folks legislators will seize this opportunity to make more ground breaking legislation.
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Old 02-08-2020, 05:28 PM   #75
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Don't get too excited. AAA hasn't done their homework very well.
I 90 in Illinois is posted 70 MPH but trailers, campers are posted at 60
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Old 02-08-2020, 05:31 PM   #76
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Actually it's the same as for passenger cars unless specifically posted lower.

https://drivinglaws.aaa.com/tag/trailer-speed-limits/

The above link is from AAA and lists towing speeds for all states as well as Canada. Might be a good idea to read and drive accordingly in the states you pass through. Might run into a bored LEO who now has legal justification to conduct a traffic stop if you are speeding. Some states have a pretty low "towing speed limit".

Take note of Arizona's law. It doesn't state a specific speed, just "Vehicles towing trailers or semitrailers may not exceed a rate of speed that causes lateral sway."
Not if you look at this site:


State Towing Speeds and State Laws You Probably Didn’t Know
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Old 02-08-2020, 08:44 PM   #77
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My truck likes 68. Set the cruise then lean back and enjoy the ride.
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Old 02-08-2020, 09:21 PM   #78
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67 is my rigs sweet spot. Pretty good fuel mileage at that and make about as good a time as going a lot faster. Less tiring and less shaking about on these increasingly deteriorated highways.
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Old 02-08-2020, 09:21 PM   #79
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55-70. I go with the laws, situation and what feels right. On some long grades in the 110 degree desert heat I stayed at 50.

I notice lots of trucks and trailers going much faster, and that’s their decision. I saw lots of them pass me and then later passed them broken down on the side of the road. I went around the country in an old truck and didn’t break Down. I’ll stick with what worked for me.
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Old 02-09-2020, 02:12 PM   #80
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Usually only going 58-60.
That's actually speeding in some states, like my neighboring state of AL.
http://www.doityourselfrv.com/state-towing-speeds/amp/*
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