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Old 07-31-2016, 05:53 PM   #85
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Had a 10% drop in fuel economy for each 5 mph increment over 55 mph on my Gold Wing motorcycle due primarily to drag of the oversized. Went from high 30s to low to mid 20s.
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Old 07-31-2016, 09:14 PM   #86
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My very best fuel economy - 13 mpg - seems to be at 61-63 mph.
70 cuts it almost in half to 7-8 mpg.
50 (speed limit on the Natchez Trace Parkway) reduces it a little.
65 mph is about all I'm gonna do. I get 10-12 at 65 mph depending on headwind, crosswind, tailwind, or no wind.


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Old 08-01-2016, 07:44 AM   #87
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Running slower the junk lasts longer including the tires,thus the cost per mile goes down...
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Old 08-01-2016, 08:37 AM   #88
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Running slower the junk lasts longer including the tires,thus the cost per mile goes down...
Very true and the lower pucker factor is easier on the upholstsery.
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Old 08-01-2016, 09:04 AM   #89
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Originally Posted by m.hony View Post
My very best fuel economy - 13 mpg - seems to be at 61-63 mph.
70 cuts it almost in half to 7-8 mpg.
50 (speed limit on the Natchez Trace Parkway) reduces it a little.
65 mph is about all I'm gonna do. I get 10-12 at 65 mph depending on headwind, crosswind, tailwind, or no wind.


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Not to beat a dead horse but you might find this informative:
My set up is 2012 EccoBoost, Heavy Duty Tow pkg. 36 gl. tank with the 3.73 rear axle pulling a 2013 30' International. The sweet spot for my set up is 72 MPH. I get that speed in 6th gear at 2000 rpm. On a reasonably level terrain it will not down shift to 5th over bridge crossings nor gradual inclines and I can easily average 11.5 MPG. At 65 mph my rig constantly down shifts and up shifts between 6th and 5th gears and my mpg drops to 10.5 and 11.0 mpg. I can get 12 mpg and no shifting at 60 MPH. So whenever conditions allow I set the cruise at 72 MPH and purr along like a kitten. When conditions change where I need to go slower I normally set it at 62 MPH and it will stay in 6th gear at 1600 rpm and at that speed I get over 12 mpg on the average.
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Old 08-01-2016, 10:00 AM   #90
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Try it at 65 in 5th gear., can you lock out od?.
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Old 08-01-2016, 10:09 AM   #91
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Try it at 65 in 5th gear., can you lock out od?.
That should work as long as the convertor will lock in 5th at 65. The locking of the convertor is a very important consideration to fuel milage.
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Old 08-01-2016, 11:19 AM   #92
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We set our 5.7 Hemi 6-speed with 3.55 axles in 4th gear most of the time to prevent regular downshifting for hills, about 2100 rpm at 60-65 mph, for best towing economy.

Now with the Ecodiesel 8-speed with 3.92 axles the downshifting is much less frequent, and the 8-speed makes the gear selection on its own very smoothly so no need to manually select a lower gear for remarkable fuel economy.
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Old 08-01-2016, 11:26 AM   #93
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Originally Posted by franklyfrank View Post
Not to beat a dead horse but you might find this informative:
My set up is 2012 EccoBoost, Heavy Duty Tow pkg. 36 gl. tank with the 3.73 rear axle pulling a 2013 30' International. The sweet spot for my set up is 72 MPH. I get that speed in 6th gear at 2000 rpm. On a reasonably level terrain it will not down shift to 5th over bridge crossings nor gradual inclines and I can easily average 11.5 MPG. At 65 mph my rig constantly down shifts and up shifts between 6th and 5th gears and my mpg drops to 10.5 and 11.0 mpg. I can get 12 mpg and no shifting at 60 MPH. So whenever conditions allow I set the cruise at 72 MPH and purr along like a kitten. When conditions change where I need to go slower I normally set it at 62 MPH and it will stay in 6th gear at 1600 rpm and at that speed I get over 12 mpg on the average.
I'm gonna say our rigs are so different.
I have a naturally aspirated V8 and you have a twin turbo V6.
I have 20" wheels. I don't know how big your wheels are.
My transmission may hunt for gears from time to time, but is barely perceptible- not like a 1985 Buick Lesabre which would downshift just because the wind began to blow-
Horsepower, torque, and transmission gearing are probably similar, but my truck has 4:30 rear end gears where your truck may have higher speed rear end gears?
I ain't goin' 72 mph anywhere if I can help it... We don't have a road in Mississippi with a legal speed limit more than 70 mph. I go the speed limit up to 65 mphbut never exceed 65 mph when towing. I won't exceed 70 not towing- not even in Texas where speed limits are 70 and 75 mph. If a car pulls out of a side road or driveway, or a kid runs out in the street, or a deer or a dog runs out...
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Old 08-01-2016, 06:01 PM   #94
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Pretty far off course from the OP's tire post lately.
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Old 08-01-2016, 06:58 PM   #95
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Speed and heat help the Marathons separate sooner...


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Old 08-02-2016, 09:01 AM   #96
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That should work as long as the convertor will lock in 5th at 65. The locking of the convertor is a very important consideration to fuel milage.
I will play with it, it gets boring out there somedays.

I do have the option to lock out gears.
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