Originally posted by DarnDave
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Standard/Regular mode vrs Tow/Haul mode, is this crazy?
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Originally posted by Dave27 View Post
I started towing on a regular basis not using Tow/Haul. It does seem to increase the mpg. When in Tow/haul mode, it takes longer to shift, and the rpms are higher when cruising at highway speeds. These seem to cause the lower mpg. I use the Tow/haul in steeper terrain, in stop and go traffic, and when maneuvering in a campground.
DaveDave and Sue
2020 GD 2250RK
2019 F-150 XLT, 5.0, 4WD, SB
Curt 17500 WDH, 3.55
GY Endurance, Dexter EZ Flex
SCPO(SW) USN, (Ret), HP: Tampa Bay ⚓️🇺🇸
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Cate&Rob Rob let's not forget winter blend fuel is not as efficient as summer blend. When you left Ontario, most likely it was winter blend (and probably the worst mileage) and as you got farther south the blend changed. Then when heading back up, the fuel blend was starting to change to summer blend. From what I understand, different regions and weather temps have different blends to account for the cloud point of the diesel. The colder the weather the less efficient the blend.
Have you seen the Fully App? I especially like it for tracking mileage not to mention it makes me look a the odometer for input so the maintenance gets done. I typically keep the center display on audio and this does not show the odometer.Joseph
Tow Vehicle: 2024 GMC K3500 Denali Ultimate Diesel
Coach: 303RLS Delivered March 5, 2021
South of Houston Texas
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If the transmission is busy or if the transmission is running with an open converter, it would be best to use tow haul. I put my truck in D and it does not hunt, will mostly stay in 5th (6 speed) except for downhill where it will upshift and may even activate AFM. Seems they got it right most of the time.
Jim
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I'm following this as I am hoping to have my 2022 in a few weeks. I know the tow/haul will be different than the 04 I had. I rarely used it except for steep grades to get the engine breaking. I think it locked the TQ converter and down shifted early during braking. Is the principle still the same in tow/haul? The 04 F350 did not have an exhaust brake on the 6.0.
One question does the tow/haul mode automatically engage the exhaust break, or is there another button to push? The 04 F350 did not have an exhaust brake on the 6.0. so this will be new. Its going to be interesting having a "Smart Truck" with a techno challenged old guy driving.
Thanks
Keith2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.
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Keith,
With a smaller and lighter fifth wheel, you may find you will not need to hold shifts longer so you may end up using regular drive mode. Leave the trans in D unless you experience trans hunting. Tow haul is used to do decel braking so this will be more aggressive in slowing down the rig and saving you on brake replacement. Your converter will lock in both modes but if your mostly running unlocked in regular drive mode, tow haul would be better. Transmission hunting drives additional heat where an unlocked converter will run a bit hotter than a locked converter.
I'm uncertain if your exh brake is build in or has a dedicated button.
Jim
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Yoda Jlawles2
The diesel engine brake is engaged with a separate switch in the center IP. When switched on, engine braking responds to either maintaining speed on cruise control or application of the regular brakes. Light braking brings in light engine braking. Heavy braking brings in strong engine braking. This function is independent of whether Tow/Haul is selected or not.
In actual function, it is amazingly similar to engine braking by the turbocharged gasoline Ecoboost in my previous F150. The more I drive this admittedly powerful diesel . . . the more impressed I am with what that 3.5L Ecoboost could accomplish, towing the same 5th wheel. There was no separate switch, but engine braking (by way of downshifting and closed throttle) engaged in the same way to maintain cruise control speed or in conjunction with application of the regular brakes. Sometimes we forget that all gasoline engines have "engine braking" when the throttle blades are closed. But, I digress . . . . .
RobCate & Rob
(with Border Collies Molly & Angel + Kitties Hazel & Elsie)
2015 Reflection 303RLS
2022 F350 Diesel CC SB SRW Lariat
Bayham, Ontario, Canada
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Originally posted by TedS View Post
Reminds me of a funny past event. Every year CDOT changed the color of the construction specifications book. Brown, green, blue...etc. Then Denver got the Rockys and the team color was purple, so CDOT came out with the purple book. I was at the unveiling as they were passed out to us engineers at a huge meeting (annual round table). It was supposed to be called the Rockys book, but I muttered (I thought softly) Barney (the dinosaur kids show)..My kids were stuck on it at the time. The big bosses weren't to happy about it until someone pointed out the purple chosen was not the Rockys color but an exact match to Barney. The second printing had the correct color, but the name still stuck.
UGGGGGGGGGGGGGGGG - now I have that stupid song going through my head.
Now back on topic - thanks for the information on the tow/haul and the exhaust brake.
Keith2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.
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Originally posted by Cate&Rob View PostYoda Jlawles2
The diesel engine brake is engaged with a separate switch in the center IP. When switched on, engine braking responds to either maintaining speed on cruise control or application of the regular brakes. Light braking brings in light engine braking. Heavy braking brings in strong engine braking. This function is independent of whether Tow/Haul is selected or not.
In actual function, it is amazingly similar to engine braking by the turbocharged gasoline Ecoboost in my previous F150. The more I drive this admittedly powerful diesel . . . the more impressed I am with what that 3.5L Ecoboost could accomplish, towing the same 5th wheel. There was no separate switch, but engine braking (by way of downshifting and closed throttle) engaged in the same way to maintain cruise control speed or in conjunction with application of the regular brakes. Sometimes we forget that all gasoline engines have "engine braking" when the throttle blades are closed. But, I digress . . . . .
Rob
In addition to a closed throttle, your gas engine would also time the cams to produce maximum pumping losses to further increase vacuum which aids in engine braking. So with downshifting, closed throttle, cam timing, and fuel cutoff, modern gas engines have very effective engine braking. Some vehicles can also apply brakes to maintain the cruise control setpoint while towing down hill.
Jim
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Originally posted by TedS View Post2021 Reflection 337RLS, 2024 Silverado 3500HD 6.6 gas with faux Allison 10 speed. Nellie the Diva, wonder boxer
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Originally posted by Cate&Rob View PostYoda Jlawles2
The diesel engine brake is engaged with a separate switch in the center IP. When switched on, engine braking responds to either maintaining speed on cruise control or application of the regular brakes. Light braking brings in light engine braking. Heavy braking brings in strong engine braking. This function is independent of whether Tow/Haul is selected or not.
In actual function, it is amazingly similar to engine braking by the turbocharged gasoline Ecoboost in my previous F150. The more I drive this admittedly powerful diesel . . . the more impressed I am with what that 3.5L Ecoboost could accomplish, towing the same 5th wheel. There was no separate switch, but engine braking (by way of downshifting and closed throttle) engaged in the same way to maintain cruise control speed or in conjunction with application of the regular brakes. Sometimes we forget that all gasoline engines have "engine braking" when the throttle blades are closed. But, I digress . . . . .
Rob
I have found that it does seem to take a long time to upshift again when the descent is done and braking no longer required - even when re-applying the accelerator.
One other note - if in the manual setting, remember to push the button twice to fully turn off engine braking. The first press (after manual) only puts it into automatic - learned that one through experience!
1 PhotoKen & Sandra
2021 303RLS | 2020 F350 Lariat 6.7L 4x4 SB SRW
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