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Tow/Haul mode - pros and cons - my 1st pull

Blazer

Full Member
Joined
May 15, 2007
Messages
55
Location
Baton Rouge, LA
I made my first long pull with my new 2007 LT3 yesterday. (5.3L, 2-wheel drive, no aux tranny cooler) It was a 300 mile round trip pulling my 22 foot bay boat. The complete rig weighs around 3500-4000 lbs. It's pretty flat down here in south Louisiana, so the only hills are bridges and overpasses.

I noticed that the tow/haul mode gave me worse gas mileage. I used it going 150 miles to the fishing hole and then did not use it going home. My average mileage down was 9.6 and the ending average mileage (without tow/haul) mode was 10.4, so I'm guessing that the trip back averaged around 11. I'm not sue, but it seems my tranny temp was a little higher without using tow/haul mode.

1) What's the cause of the mileage difference with and with out using tow/haul?
2) What are the pros & cons of the tow/haul mode?

Thanks


 
? ?the difference in mileage can be attributed to the higher shifts points.? the tow/ haul mode tells the tranny to hold the gear longer before shifting, thus revving the engine higher.? hence the lack of better gas mileage.

  the pro's would be you are in the higher power range of the shift for a stronger pull throughout the range of the tranny.

  the con's would be the worse gas mileage.  anyone else have any thoughts?
 
Tow haul keeps RPMs higher to stay in the peak torque range. It makes for less strain on the drivetrain. It also prolongs shifts and keeps you in 3rd alot. Of course MPG will suffer. I tow a couple of ATVs or snowmobiles and because of light weight, I don't use the tow haul mode. But if I was towing around 5K I would ?:D
 
I two strict;y using tow haul and in 3rd with my rig which weighs n at 4500 - 5000 lbs.

Gas milage sucks but that can't pay for a new tranny.  I get about 10 mpg.

Tiger
 
I dont tow at all but i use it once in awhile.  It sounds badass with aftermarket catbacks >:D
 
Actually, that brings me to ask a question.  I know it holds the gears longer, but does it firm up the shifts too?? Instead of doing silky smooth gliding into gear shifts, does it snap it a bit more??

I guess one of the reasons I ask is because I was coming back home the other day and had my TB really loaded with camping gear, including a small trailer.  Plus I was climbing hills (small mountains) and I noticed the it started shifting a little firmer with a 'snap' to 'em. 
 
gn85 said:
Actually, that brings me to ask a question.? I know it holds the gears longer, but does it firm up the shifts too?? Instead of doing silky smooth gliding into gear shifts, does it snap it a bit more??

I guess one of the reasons I ask is because I was coming back home the other day and had my TB really loaded with camping gear, including a small trailer.? Plus I was climbing hills (small mountains) and I noticed the it started shifting a little firmer with a 'snap' to 'em.?

Yes..it increases line pressure to firm up shifts..Another reason I no longer use it. With my Transgo shift kit and Tow/haul...wwwaaayyyy to firm  :love:
 
I'm not going there.

On the '07s, Tow/Haul disables V4 mode.
That could be another part of the decreased fuel mileage.
(At least that's what I heard. I could be wrong.)




Edit: Yup, I was wrong.
 
Waz said:
I'm not going there.

On the '07s, Tow/Haul disables V4 mode.
That could be another part of the decreased fuel mileage.
(At least that's what I heard. I could be wrong.)


Mine ONLY uses V4 mode in TOW mode!! I thought the EXTRA power came for the activation of the EXTRA 4 Cylinders!!!? :eek:





? :laugh:
 
Waz said:
I'm not going there.

On the '07s, Tow/Haul disables V4 mode.
That could be another part of the decreased fuel mileage.
(At least that's what I heard. I could be wrong.)
I thought I had read on here that people were having better luck keeping it in V4 mode with T/H engaged
 
So, I was wrong.

I'm guaranteed to be right at least once a day.

That wasn't it.
 
I tried the tow mode once in my 2500, when it shifted to 2nd, boy did I get a headacne OUCH !!!
 
Waz said:
So, I was wrong.

I'm guaranteed to be right at least once a day.

That wasn't it.

Tow/Haul mode activates the extra 4 Cylinders that are imbeded in each seat of the Av! The extra HP and torque are then siphoned via electopositron telemetry to the exhaust where it saves fuel by igniting the afterburners!!!? ?:wave:
 
I have a 4,100 lb 25' TT that I tow.  This last trip was on the highway for a while and I was running around 67.  Even with T/H engaged it shifted into OD.  After a few miles I was curious if my tranny was running any hotter.  It normally is around 195 in 3rd (60mph) towing the trailer.  I was shocked to see it was 235!  I pulled it down into 3rd and the temp dropped back to around 200.  The problem is in 3rd running 67+ the Flowmaster can be a little loud (not so politely pointed out by my wife  :beating: ).

I normally get around 10-11mpg towing. 
 
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