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Old 02-03-2016, 07:34 AM   #21
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I find being in tow mode when driving the flats causes my fuel mileage to drop due to the higher RPMs. I only use tow mode when I'm going into the mountains.
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Old 02-03-2016, 07:59 AM   #22
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Tow/Haul Mode
Tow/Haul helps the driver take full advantage of the Silverado’s and Sierra’s powerful EcoTec3 engines. Activated by a button on the shift lever, Tow/Haul modifies the shift mapping of the trucks’ standard six-speed transmission.
The result is higher shift points for more power under acceleration, and earlier downshifts to promote engine braking, thereby reducing wear on the vehicles’ disc brakes.
In addition, Tow/Haul mode activates Sierra’s Trailer Grade Braking when the driver lightly applies the brakes, thereby initiating downshifts to assist with braking on long downgrades. Auto Grade Braking not only slows the vehicle more efficiently, but can also reduce brake rotor temperatures by 100 degrees Celsius (212 degrees Fahrenheit) during a braking event.
And for those drivers who prefer to be in completely control of their truck’s shifting, improved TapShift controls on the shift lever are complemented by a patent-pending shift algorithm that improves shift response time by up to 60 percent compared to previous systems. U


Read more: 2014 Silverado, 2014 Sierra Towing Assist Features | GM Authority

I usually run in tow haul unless really really flat ground. Grade braking is awesome!
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Old 02-03-2016, 08:11 AM   #23
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Originally Posted by Donna D. View Post
I find being in tow mode when driving the flats causes my fuel mileage to drop due to the higher RPMs. I only use tow mode when I'm going into the mountains.
now that you mention it, I too have experienced a drop in mpg when in tow mode. It does work great for braking in the mountains.
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Old 02-03-2016, 08:54 AM   #24
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I too have been puzzled by what if anything is gained when my Silvy tow/haul button is pressed. Great answers, Carl! My next trip out I now have to choose between getting possibly better gas mileage and improved transmission/braking performance. Hmm.
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Old 02-03-2016, 09:15 AM   #25
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I find with my Sierra that the first thing I do when towing is shut off the grade braking. I find it annoying as I like to manually gear down, nothing worse then wanting to pick up a couple mph descending a small hill knowing you will quickly lose it going up the other side and the grade braking kicks in. The shifting in the tow haul mode is much improved when towing I find.

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Old 02-03-2016, 09:17 AM   #26
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Grade-braking is one of my favorite features on our 2013 Yukon. Starting with the 2013 model year you don't need tow mode on for it to be active. Grade-braking uses both the engine and transmission. "No grade braking is available in Range Selection Mode (Manual Shift Mode)".

Was noticing delayed upshifts during our trip to Colorado and stopped at the GMC dealer in Gunnison. It only cost me $105 for them to tell me everything was ok-no codes, but recommended not using tow-haul mode going uphill. It worked.

While I know we have a trailer with our 5.3/3:42 going uphill at this time a switch to the 6.2/8-speed would mean a 2015 Yukon Denali. Used they are $60K-ouch!
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Old 02-03-2016, 09:40 AM   #27
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I experimented towing to and from Osoyoos, without tow mode and with tow mode, my overall mpg increased one mpg while towing in tow mode over 7,000 miles, 12.8 to 14 mpg, and that is a rolling average over the entire 7,000 miles. I drive by my tach and cruising I'm under 2,000 rpm and sometimes the "Eco" kicks in deactivating 4 cyl. Under load it will go to 3500-3700 rpm. My trans temperature has always been the lowest number compared to my water and oil readings, in fact my oil is always the highest.
I think your rear end ratio will also impact your performance. Mine is 3.21.....
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Old 02-03-2016, 09:52 AM   #28
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I think your rear end ratio will also impact your performance. Mine is 3.21.....
I find my rear end ratio is getting larger with age. Guess that's affecting my performance...
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Old 02-03-2016, 09:53 AM   #29
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I watch my tach too, and am most happy when it's at 1800 or slightly higher but do recall noticing a significant jump to 2500 when in tow mode. These are casual observations of course, not carefully monitored ones taking notice of terrain, etc. Next long trip out think I will do more controlled experimenting.
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Old 02-03-2016, 10:04 AM   #30
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I find my rear end ratio is getting larger with age. Guess that's affecting my performance...
You mean it is starting to sag.....
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