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Old 02-18-2015, 05:48 PM   #29
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1994 34' Limited
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I take as much speed as I reasonably can paying more attention to the engine work load and temperature. Towing over the coastal range and along the Oregon coast there were times that 35 was the best I could comfortable do.
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Old 02-18-2015, 08:19 PM   #30
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Uphill MPG and speed

The only hill I haven't been able to take at 65 or 70 is the 8% pull just south of Globe, AZ on hwy 77.

I like to run the speed limit.

MPG is what it is, hills don't make much difference with my rig and driving style, if I drive under 60 I will get about 11, if I go faster I will get as little as 9.


1/2 Ton 4WD Truck, 72 Sovereign Hensley Arrow
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Old 02-18-2015, 08:54 PM   #31
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A lesson I learned is buy enough tow vehicle. Tow capacity is rated in pounds. Air drag happens and at speed takes horsepower to overcome. Putting this together, divide trailer gvw by TV tow capacity equals a percentage of capacity. In my case 2014 International 27FB est. gvw. 8000#, 2015 2500HD Silverado 6.7L Duramax 14000# tow cap. 8000÷14000= .578. My TV is entirely capable of towing at ant speed anywhere. Towing I get 9-12 mpg. My previous TV 2011 1500 5.3L 9600# capacity 8000÷9600=.833 towing mpg 5.5-8. The biggest difference is overall towing confidence. Up hill, down hill any speed, safe confident secure.
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Old 02-19-2015, 05:55 AM   #32
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Question

Speed & MPG, not that relevant.....2000rpm,(63mph), is our 'sweet spot' when toeing loaded, barefoot I don't sweat it.
Uphill, downhill matters little.

MPG is a secret, you wouldn't believe me anyway,

Bob
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Old 02-19-2015, 11:36 AM   #33
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Originally Posted by Sodbust View Post
Hard pulling I lock my trans in 4th gear if I can.. Reason,, 4th on my pu is direct and the power flows in and out without any clutch packs turning.. With that along with my 4-1 gearing limits me between 50 and 65 mph.. I monitor my engine load gauge more than anything as I don't like to apply anything over 75% POWER for any given RPMs.. I do ck the trans temp,, and engine temp,, but have never had it out of normal range ever..



On a real hard pull that 4th cant keep up I will drop down to 2nd and float the power at or under that 75% power setting..



No engine has been made to pull at 100% power for any constant amount of time.. Anyway not if you wish to see 350,000 miles life out of it..



Sodbust

This said it best.
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Old 02-21-2015, 12:25 PM   #34
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Thanks all

The RPM info was most helpful. I have electronic RPM readout, but was clueless as far as it being useful info.
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Old 02-21-2015, 01:38 PM   #35
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The RPM info was most helpful. I have electronic RPM readout, but was clueless as far as it being useful info.

An Ultragauge can give you engine load percentage among other useful readouts.
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Old 02-22-2015, 07:45 AM   #36
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If you want to see what's REALLY going on, hook up an Accutron or any other upper end scan tool to the Assembly Line Data Link under the dash. You can watch all the sensors in real time.
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Old 02-22-2015, 10:05 AM   #37
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If I only had a brain……..

Hey Navy, Data doesn't help me much, as I don't know what the parameters of the sweet spots are. Thus far, I have just been using the sound of the engine to warn me that I was pushing the limit.
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Old 02-23-2015, 06:05 AM   #38
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True. Seat-of-the-pants is the only way to fly. Lots of data can be used to impress your friends and family......... Really....
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Old 02-24-2015, 08:40 AM   #39
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Using the math formula from post 31 above, our number is .79 and we can maintain speed with no issues by watching EGT, water temp, transmission oil temp and rear differential oil temp. We averaged close to 13 mpg coming back from Long Beach to Phoenix last Friday on I-10, which includes a long climb east bound out of Palm Springs.

Our combination seems to be a perfect match for us.
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