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04-05-2013, 01:11 AM
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#1
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Senior Member
Join Date: Nov 2012
Location: Virginia
Posts: 865
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Increase in fuel mileage.
I took my first trip into the mountains this weekend with my new truck and TT. I was pleasantly surprised to see that my truck actually got better fuel mileage crossing the mountains on a switch back road than compared to the open interstate. I was getting about 10.5 on the interstate and almost 1 mpg better on the mountain roads. Granted, my trailer is small compared to my truck, Cougar 28RBS and a DRW Ram 3500, but it was still a surprise. I was expecting a drop of at least 1/2 to 1 mpg. My truck has 4.10 rears and I was able to just ease up off the corners without a lot of excess throttle. The Jake brake was nice on the switch backs on the downhill side. I actually used very little of the brake pedal. The drive was as much fun as my stay has been. Hopefully, the same can be said for my trip home on Sunday.
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04-05-2013, 03:17 AM
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#2
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Senior Member
Join Date: Dec 2012
Location: Woodstock, GA
Posts: 405
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Good deal. Enjoy your trip.
I too am out right now and the first time I pulled my camper down the interstate with my new truck. Truck only has 1800 miles and I got 11.6 on the trip up based on the computer. I checked the computer twice versus hand calculations and it was right on. Hopefully it might get a bit better as the truck gets broken in. If not still pleased. I have 3.55 rears in my PS 250. I am pulling a 311 bhs Sprinter which has a dry weight of 8260. Almost hit the s ales going up but we were in a hurry, said the DW!!
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04-05-2013, 07:57 AM
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#3
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Senior Member
Join Date: Jan 2011
Location: Central Florida
Posts: 478
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What were you cruising at on the interstate vs the switch-backs? Bet speed was the reason for the change in mileage.
__________________
2011 Chevy Silverado 3500HD Ext Cab LT DRW Duramax/Allison pulling a 2012 SOB (still Thor, but not a Keystone), Dual ACs, 4 Door Fridge, Fireplace, Sleep Number Bed, Level-Up Auto Levelers, Disc Brakes, Winegard DirecTV SlimLine Auto Dish, Onan 5.5K, Splendide Combo Washer/Dryer, GY G114s on HiSpec 17.5 wheels, TrailAir Tri-Glide Pin Box, Mor/ryde IS.
Michelle & Ann Sullivan and 4 American Shorthairs
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04-05-2013, 11:03 AM
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#4
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Senior Member
Join Date: Nov 2012
Location: Fruitland
Posts: 3,357
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On my truck speeds, freeway 55-60 I get 16 up to 17 mpg empty. 65-75 it drops to 11-12mpg. I tow at 55-65s and get the 10 to 11mpg. I have not checked at lower speeds towing yet. But, remember the 460 and 454 engines I had them and was lucky to get 6 mpg, mostly towing was below 5mpg. I just wish fuel costs could be the same as thoose days.
__________________
2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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04-05-2013, 05:26 PM
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#5
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Senior Member
Join Date: Nov 2012
Location: Virginia
Posts: 865
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Quote:
Originally Posted by mhs4771
What were you cruising at on the interstate vs the switch-backs? Bet speed was the reason for the change in mileage.
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65-70mph.
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04-27-2013, 01:09 PM
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#6
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Senior Member
Join Date: Mar 2013
Location: Illinois
Posts: 581
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Better MPG
I was pleasantly surprised when going from a 24ft TT weighing about 5500 lbs and getting 8-9 mpg, to a 5ver around 7000 getting 9-10mpg. I'm assuming it more about wind resistance? I usually drive 60-65 when towing.
Today brought the 5ver home from service, and was a windy day, only got about 8 average for the 100 mile trip, so guess it really depends.
In my empty truck, I really notice a difference when I drive faster: 60-65 get about 19-21, at 70+ that drops to 17-18. Being an RV owner, we all accept low mpg, or we'd just fly there.
__________________
Ed & Mary
2017 Cougar 333MKS
2015 RAM 3500 HD with 6.4L
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04-27-2013, 07:24 PM
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#7
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Member
Join Date: Apr 2013
Location: orange county
Posts: 47
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guess i should feel good - 55 - 60 i get 11+ mpg, but those winds - coming down from grand canyon to barstow got down to 7-9. ford f150 v8 towing 24 foot tt. do you have it on "tow" or once on the highway, back to normal? i don't know if there is a huge difference.
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04-28-2013, 04:42 AM
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#8
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Senior Member
Join Date: Jan 2012
Location: Central San Joaguin Valley, CA
Posts: 2,117
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Quote:
Originally Posted by ed cobos
guess i should feel good - 55 - 60 i get 11+ mpg, but those winds - coming down from grand canyon to barstow got down to 7-9. ford f150 v8 towing 24 foot tt. do you have it on "tow" or once on the highway, back to normal? i don't know if there is a huge difference.
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FWIW - the 'Tow-Haul' mode does not change your gear ratios. It changes your shift points so your truck does not "hunt" for the proper gear while under load.
I always run in 'tow-haul' when towing - that is what it is for
__________________
Jack & Marty
2018 Laredo 298 SRL
2011 F-250 SB Crew Cab 4x4 6.7L
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04-28-2013, 05:11 PM
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#9
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Senior Member
Join Date: Jan 2011
Location: Central Florida
Posts: 478
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Don't know about Fords, but on GMs when in Tow/Haul it also locks the Torque Converter up in lower gears, cutting down on slippage and heat.
__________________
2011 Chevy Silverado 3500HD Ext Cab LT DRW Duramax/Allison pulling a 2012 SOB (still Thor, but not a Keystone), Dual ACs, 4 Door Fridge, Fireplace, Sleep Number Bed, Level-Up Auto Levelers, Disc Brakes, Winegard DirecTV SlimLine Auto Dish, Onan 5.5K, Splendide Combo Washer/Dryer, GY G114s on HiSpec 17.5 wheels, TrailAir Tri-Glide Pin Box, Mor/ryde IS.
Michelle & Ann Sullivan and 4 American Shorthairs
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04-29-2013, 07:01 AM
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#10
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Senior Member
Join Date: Jan 2012
Location: Central San Joaguin Valley, CA
Posts: 2,117
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I believe you are right. I notice a much more positive upshift and can feel a more positive downshift when coming to a stop.
__________________
Jack & Marty
2018 Laredo 298 SRL
2011 F-250 SB Crew Cab 4x4 6.7L
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