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  #21  
Old 06-05-2013, 02:36 PM
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Quote:
Originally Posted by seanbeckaroo View Post
Not true; I tow on a 87 performance tune, and simply run 89 octane while towing. I've even towed on 93 performance tune with no knocking.
Well first off an 87 tune is more of a regular tune, not a performance tune. And if you are using 89 octane with an 87 tune you are essentially counter acting the problem with higher octane gas. Which makes sense, that's the right thing to do.

There's also more that plays into it though. What kind of weight are you towing? Is it only on flat land or are there hills/mountains? That significantly changes the load on your truck and the amount of potential knock at different tune levels with different octane fuels.
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  #22  
Old 06-05-2013, 02:37 PM
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^yeah what seanbeckaroo said is right, when I towed the 4000lbs with my truck I was on the 87 performance tune, using 89 octane. It's a PITA to switch to the tow tune every time so just fill up with higher octane. Seems to get better mpg anyway from my experience. I will say the tow tune did pull a little better at the lower rpms.

It's pretty common for people to tow on performance tunes with higher octane fuel. Check out the superchips forums, it's actually usually preferred over the tow tune...

And not only that, but the tow tune requires 91 octane. I was able to increase capability over stock, and use 89 octane(cheaper than 91).
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  #23  
Old 06-05-2013, 03:38 PM
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Has anyone had the tranny update done? did it make a difference? what exactly do they change?
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Old 06-05-2013, 06:24 PM
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I tow a 25ft boat and trailer (around 4000lbs) what I have done is tow it in tow haul mode but if the is a flat long stretch turn it off and it upshifts, bropping the rpm, but still doesn't seem to help the mpg's, I had the same thought, but I just don't think you can get better mpg's while towing, that's the way it seems to me.
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Old 06-08-2013, 02:56 PM
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Well I had it in at a dodge dealer yesterday to check out the pinion nut recall and had them check over the trans, they found nothing wrong but did the computer update for the transmission. It seems to run through the gears better now might shift a bit harder aswell, just gotta wait till I go camping again and see how it pulls.
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Old 06-10-2013, 12:59 PM
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Let us know how it works
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  #27  
Old 06-10-2013, 01:24 PM
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Quote:
Originally Posted by ryan69 View Post
So what can I do to get optimum gas mileage while towing?
I think I want to get a bully dog or trinity tuner.
Just cant decide witch tuner will best suite my needs. Does either have a towing tune? or does everyone just use the performance tune for towing?
Does anyone else out there pull 6000lbs with there half tons? Or am I the only one that dosent want to spend a pile more and get a diesel?
My trailer setup is about the same as yours. It takes a lot to get it into 5th. Most of the time it is in 4th for me as well. Of course this is with the "6 speed" tranny on the 2012 and in TH mode. I don't have an issue with it since I'm sure my total weight is over 7,000lbs and I don't want to fry the tranny. This was last year without the BD tuner. I will be doing a 900km trip in July to the Smoky Mountains. I expect to be having a revving good time once I hit lower Ohio when it starts getting hilly.

You can't compare to guys running a 4,000lbs trailer.
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  #28  
Old 06-10-2013, 05:21 PM
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I just towed 6000lbs to georiga and back from North east ohio, roughly 1300 miles. I averaged 11.3mpg for the trip. On any medium or large hills it would downshift one gear, then upshift at the top and it would stay in top gear, on the smaller hills it would hold 75 in 5th. The only time it downshifted to third I had the cruise on at 75 and I was going up fancy gap in Virginia, which is a roughly 7 mile long hill.
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  #29  
Old 06-10-2013, 08:07 PM
Northernmedic Northernmedic is offline
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There are many factors that will effect performance and MPGs while towing. Frontage on a fifth wheel tends to exceed that of holiday, cargo, and boat trailers. Frontage will add to your drag co-effiencent and will require higher torque hence RPMs to counter-act. It is extremely easy to acquire extra weight in a fifth wheel once loaded. Clothing, food, propane, water, bedding, etc... add up very quickly. Also tire inflation pressures on trailer tires is crucial, so is the tire inflation pressure on the truck.
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  #30  
Old 06-11-2013, 12:46 PM
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Quote:
Originally Posted by Northernmedic View Post
There are many factors that will effect performance and MPGs while towing. Frontage on a fifth wheel tends to exceed that of holiday, cargo, and boat trailers. Frontage will add to your drag co-effiencent and will require higher torque hence RPMs to counter-act. It is extremely easy to acquire extra weight in a fifth wheel once loaded. Clothing, food, propane, water, bedding, etc... add up very quickly. Also tire inflation pressures on trailer tires is crucial, so is the tire inflation pressure on the truck.
Your absolutely correct your points about weight and tire inflation. Your also correct about drag being the biggest concern. The only point I'd make is it isn't the additional frontal area of the 5th wheel that makes the difference. In a trailering setup the front area only accounts for approximately 25% of total drag and much of that is already accounted for by the front of the truck. Where trailering really increases drag is from three areas.
  1. Side and under body - The trailer is obviously responsible for a high percentage of the under vehicle and side area drag compared to the truck. This is turbulence as well as friction from the greatly increased surface area.
  2. Rear of the trailer - the blunt end of the trailer is very inefficient compared to the tow vehicle by itself.
  3. Gap - the disrupted airflow between the pickup and the trailer is added. It's not necessarily that high (maybe 20% of total drag) but it's non-existent if your not towing.

This may be more information than most want but the important thing to know is pulling a trailer puts your Drag coefficient much higher and that makes the biggest difference in your MPG for long hauls because of it's relation to speed (velocity). Yes weight is a factor; yes RPM's are a factor, yes rolling resistance is a factor but at highway speed drag is the biggest factor. It can account for up to 2/3 of the fuel used. As speed increases the drag goes up quickly because drag increases at the square of the velocity. Our trucks have a decent coefficient of drag so towing really blows that to hell.

Assuming you truck is running properly, if you want to save gas with a trailer simply slow down. Everything else is playing with minutia in comparison.
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