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Old 12-01-2014, 11:38 AM   #15
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While air drag goes up exponentially with speed, all other forms of friction do the same thing.... like rolling resistance of tires, drive-train friction, etc. I'm not the speed police, nor am I a tree hugger... but I'll hang back at 62 - 65 mph and get there just fine. Tire speed ratings probably have some lawyer cushion built in to that 65 mph speed limit.... and maybe more than we might think, but I'm still happy with that speed for going long distances. I'll be heading to the Phoenix area sometime soon, and it's a bit longer trip towing at 62 - 65 than just hittin' the road at 75 -80... but then, I've hurried enough in my 63 years... and I'm done with that.
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Old 12-01-2014, 11:53 AM   #16
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I run 58 - 62, my sweet spot is 1400 rpm's and 62 mph. With a 400 ISL, I'll only get 7.5 at the most. But if I stretch the truth, I generally get 12 mpg.
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Old 12-01-2014, 12:16 PM   #17
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FWIW Contemplating what one's time is worth when retired is sort of moot. One gets paid anyway. OTOH it is often more interesting to do 55 on the slow roads enjoying the things one sees rather than sweating the morons on the superslabs doing 70-75 just to get somewhere. For me it's the journey not the destination. ;-)
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Old 12-02-2014, 03:17 PM   #18
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[QUOTE=TDI-Minnie;2330587]Well, I guess it all depends on what your time is worth.
Some people bill $100+ per hour for their time. Saving 2-3 miles per gallon will never make you whole.
Even if your time is only worth $15/hr, you can easily afford the extra gallon of fuel if you save 30+ minutes.
Just another view from an economics angle.

Also, what can you do with the time saved? Sleep in, or arrive at camp before dark or rain? Play with the kids... That's worth something too.

Saving 2 or 3 mpg really isn't ever much of a consideration for me. I do like to get the best fuel economy I can... up to a point.

That's my thought on MPG although Im not the guy who tows at 75-80mph either. Most of us have spent $20,40,60k on a truck and another $20-60K+on trailers or a motorhome. What difference does it make if you get 10.5 at 70 and 9 at 75? I have never calculated my mpg and don't plan to. I'm not a rich man and have older equipment than most on here and we are gonna go camping whether the truck or MH gets 5mpg or 15mpg. If gas/diesel gets to 6 or $7 a gallon we just won't go too far.

I normally tow between 60-63 and will hit 70-75 on a good open stretch
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Old 12-06-2014, 01:41 PM   #19
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I tow at 60-62 29K combined wt 2011 RAM Dually with 36' Mobile Suites. NW WA to SoCal and back hand calc average of all tanks 9.0mpg with a low of 8.4 and a high of 10.4.

Looking forward to see how my recently ordered 15 RAM Dually compares.
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Old 12-06-2014, 01:50 PM   #20
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Quote:
Originally Posted by Cummins12V98 View Post
I tow at 60-62 29K combined wt 2011 RAM Dually with 36' Mobile Suites. NW WA to SoCal and back hand calc average of all tanks 9.0mpg with a low of 8.4 and a high of 10.4.

Looking forward to see how my recently ordered 15 RAM Dually compares.
That Asin and refined aerodynamics should help. Also having DEF vs DPF should make a difference too. I know my 2012 HO picked up 4mpg average with deletes. Amazing how inefficient the EGR and DPF are.

Can't wait to see your results.
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Old 12-06-2014, 05:18 PM   #21
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That Asin and refined aerodynamics should help. Also having DEF vs DPF should make a difference too. I know my 2012 HO picked up 4mpg average with deletes. Amazing how inefficient the EGR and DPF are.

Can't wait to see your results.
The front axle disconnect is suppose to make 1mpg difference and with DEF should help. If I average 9.5 to 10 towing I will be happy.
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