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Old 04-01-2014, 08:56 PM   #29
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Bob glad all went well at j.c. ,I'm going to have to go back as we have more things to visit also,have a safe trip back home. Don and Carole (scamp)
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Old 04-01-2014, 10:29 PM   #30
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Quote:
Originally Posted by wncrasher View Post
Check your manual about tow/haul mode. On my 2011 Silverado, it says not to use it unless you are over 75% of the trucks haul capacity. You could get better mileage by not using it, if not needed.
Can't speak for Chev, but our 2006 Tundra and 2012 Ram 5.7 always did better on fuel economy in tow haul mode (overdrive automatically off) when towing. This was because the transmission would shift down and up consistently to cope with most grade changes and headwinds by getting enough engine rpm to be in an adequate torque range.

So it really wasn't about % of the truck's haul capacity, it was about road characteristics and weather conditions. It could do okay in overdrive on fairly level roads but I soon learned that is not the norm.
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Old 04-02-2014, 08:27 AM   #31
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Ok I checked the owners manual ,G.M. says tow haul mode is designed to be most effective when the vehicle and trailer combined weight is at least 75% of the vehicles gross combined weight rating( gcwr). Also in the tow haul mode the trans hangs on to the gear longer so less up and down shifts,less wear on clutches or bands and you also get engine braking :the trans will downshift to assist in slowing down , this is done by vehicle speed ,throttle position, and brake pedal position (on or off),also manifold absolute pressure(map )sensor (engine load)input to the power control module ( PCM,fuel and trans computer) the manual states there is no harm in using tow haul mode if the load is lighter then 75% of the combine vehicle weight! Operation the vehicle in tow haul mode when lightly loaded or with no trailer at all will cause no damage,however ,there is no benefit to the selection of tow haul when the vehicle is unloaded.such a selection when unloaded May result in unpleasant engine and transmission driving characteristics and reduced fuel economy tow haul is only recommended when pulling a heavy trailer or large heavy load. Well I'm going to have to try with it off and see what kind of fuel economy I get and then make my decision on whether to select it or not!i guess it also depends on road conditions hills etc..
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Old 04-02-2014, 01:16 PM   #32
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Haul mode was effective through the Appalachians, slightly higher RPM, other than that little noticeable difference with the exception of very effective engine braking on steeper downgrades. I think I'll keep using it in hilly country even though I'm probably well below 75% GCWR. Probably won't use haul mode until the east slopes of the Rockies now.
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Old 04-09-2014, 03:16 PM   #33
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Home Sweet Home,,, safe and sound. Just under 2400 miles of towing now, in some crazy weather much of the way. Spring is coming in like a lion I guess. Towing average didn't maintain the 13 mpg I reported earlier, a better number is probably 11.5 mpg. The wind is the big factor, fair winds added 2 mpg. One day, we fought a 40 mph head and side wind all day, my average for the tankful went down to 9 mpg.

Enough of the data, I'm happy with the vehicle, comfortable, quiet, enough power. Can't ask for more.
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Old 04-09-2014, 08:45 PM   #34
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I appreciate you sharing your experiences with your new truck. I am having similar experiences with mine regarding solo fuel mileage. I cannot report on towing yet. I have not towed except once, a very short tow. The computer on my truck gives slightly lower mileage than I measure/calculate. I calculated 22.3 mpg on one tank, my best, running solo at 55-60 mph with at tailwind. Usually I get just under 20 mpg highway and around 16 mpg around town. I have a little over 4,000 miles on my truck now.
I hope to get in a few short towing trips this spring. Then I'm planning to go out west this summer, at least 6,000 miles round trip. Your post of your experience in the mountains makes me feel a lot better about taking my truck on a very long trip with little towing before.
Thank you!
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Old 04-10-2014, 01:29 AM   #35
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Hey Bob glad you made it back safely ,boy that wind really cut your fuel economy, but glad your happy with your truck , I'm a little worried about my truck as there are some 5.3L engines affected in 2012 for the oil consumption problems. So far so good !

Don and Carole (scamp)
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Old 04-14-2014, 01:02 PM   #36
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Adding my experience. 2014 GMC Sierra 1500 5.3L Ecotec, 3.73 axle, Propride pulling a 25 FC RB. CAT scale weights Truck (Full Fuel, driver) 6820 and trailer 5100, this is with the PP engaged.

Two long trips so far. Approx 2000 miles from Colonial to Denver. And just returned from a trip to Las Vegas, 2200 miles the long way down through Albuquerque and across.

The 5.3L does a great job. Overall MPG was 11.23, towing at 64mph. 6% grades I was able to stay at 55-60mph no problem. Acceleration onto the highway was fine. Stayed in tow haul mode the entire time. The 2014 manual also mentions tow haul for primary use when the overall vehicle/trailer weight is more than 75% of the GCWR. Mine is about 79.5%.

Had the same experience going through the mountains of PA on the way home from Colonial. Averaged 9.63. Guessing that it was lower due to very heavy (30-40mph) head winds from eastern Kansas until we got home.

Downside to the Sierra is weight capability. With full tank of gas, me the wife and dog there is only about 60# left for additional cargo. Don't trust the published numbers. They appear to be for a stripped down truck. Start adding what most would consider normal stuff and my truck is nearly 500# heavier. Items like a sunroof, 20" tires and rims, bed liner, bed rollup cover quickly eat into the available weight. Throw on the tongue weight of the FC and nothing left.

So I have a 2500HD on order. Didn't know, and had no plans for a larger trailer, when I got the Sierra 1500. But the AS bug struck. With the types of driving conditions we have in Colorado, one minute nice, next ice, snow, sleet, rain, wind I just don't feel comfortable cutting into the design safety margins for overall weight carrying on the truck.

Bottom line, smaller trailer, less tongue weight (no Propride) then the Sierra 1500 is a great choice and more than capable of getting it done. FYI general around town mixed mileage I get 18+. Highway not towing 20-22mpg.
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