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Old 03-24-2014, 11:07 PM   #11
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*chuckles* why do you think it's called a "tow/haul" button?
I will only speak for Ford trucks in particular (but I can't believe it does not generalize to other makes)
ALWAYS use tow/haul - that's why it's there - to electronically adjust the engine, transmission and other systems to tow or haul something.
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Old 03-24-2014, 11:13 PM   #12
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Use the tow haul mode, it's there to protect the transmission as much as to improve towing. Less shifting, higher shift pressure, different converter lock up criteria, etc.

As for improving MPG, a lot of what you hear is bunk. I mean, all those advertisements that claim "Up to 30% improvement in MPG and power!" really must be drinking good stuff, otherwise I'd install three of them and nearly double my power and MPG!

Keep your injectors cleaned every 25-40,000 miles, keep your oil changed, keep tire pressure at spec, when it's tire replacement time pay attention to mileage claims as tires can make a HUGE difference in MPG especially in truck tires. BFG Mud T/A's look awesome aren't the hot ticket for decent MPG but the All Terrains are better and Long Trail TA's are better still.

Dropping a few MPH helps more than I can say. I lose two MPG towing at 70 vs. 60.

And, don't just leave the cruise on. On the flats, sure. But climbing a hill? The truck will floor it to maintain speed where you would back off a little knowing that 5-10 MPH isn't that important.

It's all about being efficient.
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Old 03-24-2014, 11:24 PM   #13
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Always leave you're TV in the tow position and your cruise off(from everything I have read on towing)leaving your cruise off will prevent your tranny from shifting excessively when going up even a small grade

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Old 03-24-2014, 11:27 PM   #14
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Oh and one other thing (this was discussed in a thread several months ago)...
Learn to drive 55 again yeah, with my beast of a truck I can yank our 5er down the road at 75....at @ 7MPG
Or at 55 at @ 12-13 MPG
You decide
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Old 03-25-2014, 09:02 AM   #15
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I used to use tow/haul all the time on my Dodge trucks and I do use the cruise control and I found they worked fine and the cruise control would even downshift the truck on a hill for braking to keep as close as possible to the selected speed. The Ford worked the same in that regard, it just has more powerful compression braking than the Hemi trucks did. I use manual mode with the SD and shift myself with the cruise on and it makes quite a difference in mileage as it is amazing how hard the 6.2 will pull when it needs to. Now I have an SCT programmer with custom tunes that make no pretention to better mileage just more power and better control with abt the same mileage when using the tow programs. As to your Toyota I know nothing about their tranny programming.
And I also drive 60 - 62 mph max.
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Old 03-25-2014, 11:03 AM   #16
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Toyota Tundra 5.7 pulling 8314 BSS with a listed dry weight of just under 7000 pounds. My previous trailer was a Jayco weighing around 1000 pounds less. Although I have not weighed it yet I figure I am pulling 7500 plus. Power from the Tundra 5.7 has never been a problem but when I pull the trailer it does like to stop often for fuel. I have made 4 trips now with this trailer and I have seen a worst of 8.9 mpg and a best of around 11.5. Looks like my average is going to be around 10 or so. I stay in tow setting all the time and never use cruise unless I need to scratch my foot. I also use the downshift button on the transmission shifter manually. I have been around trucks and pulling trailers for a lot of my life and I can tell when the tow vehicle is lugging down. Tundra has a 6 speed and you can lock it down into any of the 6 so if I am going up an incline knowing it is going to drop down a gear then I downshift and leave it in fifth until I know it can pull in 6th without downshifting. This seems to minimize the "gear hunting" somewhat.
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Old 03-25-2014, 11:34 AM   #17
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My owners manual (Ford F250) says to always use the Tow/Haul button if towing unless on snow or ice. I always use it and seldom, seldom, seldom tow on snow or ice. It doesn't seem to matter a whole lot on miles per gallon. I don't think I have had the cruise on more than once or twice while towing.
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Old 03-26-2014, 12:15 AM   #18
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Quote:
Originally Posted by Klbrown53 View Post
Toyota Tundra 5.7 pulling 8314 BSS with a listed dry weight of just under 7000 pounds. My previous trailer was a Jayco weighing around 1000 pounds less. Although I have not weighed it yet I figure I am pulling 7500 plus. Power from the Tundra 5.7 has never been a problem but when I pull the trailer it does like to stop often for fuel. I have made 4 trips now with this trailer and I have seen a worst of 8.9 mpg and a best of around 11.5. Looks like my average is going to be around 10 or so. I stay in tow setting all the time and never use cruise unless I need to scratch my foot. I also use the downshift button on the transmission shifter manually. I have been around trucks and pulling trailers for a lot of my life and I can tell when the tow vehicle is lugging down. Tundra has a 6 speed and you can lock it down into any of the 6 so if I am going up an incline knowing it is going to drop down a gear then I downshift and leave it in fifth until I know it can pull in 6th without downshifting. This seems to minimize the "gear hunting" somewhat.

Forgot to mention,

I tow at around 60 mph, maybe 65. I try to not get in a situation where I am in that big of a hurry. I have NO TROUBLE at all getting up to highway speed. Now hauling 13,500 pounds to a stop is a completely different issue. You have to respect what you are pulling. Use the technology of your tow vehicle and most of all use common sense. I check the mpg some but it is what it is. I knew it would be in the ball park of 10 or 11 before I got it and I can live with it.
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