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Old 05-16-2015, 11:23 AM   #31
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Location: Watauga, Texas
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Fuel mileage - or lack thereof

We did get around 8 pulling fully camp ready and the GMC got about 17 empty highway average; indeed about 1/2 mileage. I added a K&N cold air system and then had a set of quality dual exhausts ($1K) recently. We now get 10 pulling on the same routes as before, and empty not towing we get about 20-20 1/2 highway; still about 1/2 but a bigger half. I have to weigh again, but per the last time I figure we are pulling the Windjammer at about 7500# and all-in GVW for the rig is about 13,200#. The 1500 GMC is rated for 15,000# so we are good. Local intown driving didn't improve much, but I am pretty sure that when I get tired of listening to the new dual exhaust sound it will pick up.

D_B Travelers - 8 nights in 2018, 58 nights in 2017. [U]1st love: 2014 TT WJ3001w, now 2016 40' FW SOB, 2015 GMC 3500HD CC DRW Duramax, TST 507rv TPMS.
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Old 05-16-2015, 11:25 AM   #32
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my 2013 ram 1500 hemi 392 gears 8 speed about right on our puma 6 to 8

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Old 05-16-2015, 11:29 AM   #33
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Sounds bout right. Wind conditions will have big effect also. Into a headwind may drop 1-2 more MGPS. Tire inflation will make a diff also. I was running C range tires at 8.5 mpg and now with D range I am getting 10 mpg
2014 Windjammer 3025W Diamond 34.5 ft 8300 lbs.
2010 F150 SC XLT 4x4 5.4L, 3.55 gears 20" rims
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Old 05-16-2015, 11:32 AM   #34
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I tow a Roo 183 with a turbocharged 2014 Explorer Sport. Without towing, I get 16-22 mpg. With the trailer, I get 8-10mpg (normally on the low end).

My neighbor swears that something must be wrong with my vehicle because of the low gas mileage while towing. He know what he's talking about.

I agree with the frontal area being the main culprit. I see no difference when pulling fully loaded versus empty.
Eric & Abby
2016 Rockwood Roo 183
2014 Ford Explorer Sport
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Old 05-16-2015, 11:33 AM   #35
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Originally Posted by wind and waves View Post
I have a 2003 Dodge Ram 3500 5.7 liter HO, six speed. I just drove to Minnesota from California to pick up our new trailer, a 2011 Rockwood 8281ss (31 feet) Empty I averaged 19.4 mpg. Coming back towing it was 11.7 mpg. I am sure the average would be a lot higher if the cruise wasn't set at 75 both ways. That makes a big difference as well.
You sure that isn't a 5.9 liter HO Cummins.
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Old 05-16-2015, 11:39 AM   #36
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I have 12 Dodge 2500 with 5.7 Hemi and pull 37 foot toyhauler. Empty truck gets between 21 and 15 mpg depending on driving conditions. I went to Yellowstone last year and on the way up got about 7.5 mpg. I had just put it in tow/haul and left it there. On the way back I found if i locked it in 4th the mileage picked up to little over 8 mpg and the transmission didn't shift nearly as much. Only time I let it shift on up to 5th was on very flat roads. 5th and 6th are both overdrive and 4th is direct drive. It was much easier driving in 4th as speed stayed nearly constant unless very steep hill.
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Old 05-16-2015, 12:05 PM   #37
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You've got a ton of replies and probably don't need another one - but ... your experience sounds right. I have a different truck/trailer combination so it's not exact comparison, but I went from a 21.5' Palomino to a 305 RES and my MPG is about the same. The biggest things that impact my mileage:

(1) Tire pressure

(2) Road terrain (elevation)

(3) Speed

I obviously only have control over (1) & (3), and there's only a slight impact.

I have to agree with a few others that I find no difference if I'm pulling a loaded trailer vs. and unload truck & trailer.

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Old 05-16-2015, 12:10 PM   #38
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Location: Pensacola FL
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I have a Micro-Lite 21FBRS and tow with a 2008 Land Rover HSE. I have to use the sport shifter so I'm always in 5th gear in cruise at 64 MPH, downshifting to 4th and 3rd as needed. When I do my highway gas mileage goes from about 18 MPG down to 10 when loaded, 10.5 when coming home minus food. On flatter drives I have gotten as much as 12 MPG.
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Old 05-16-2015, 12:40 PM   #39
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I tow a flagstaff 21mbrs with a 2014 tundra 5.7 and get between 10/12 mpg. i have gotten as high as 13.
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Old 05-16-2015, 12:50 PM   #40
Jeffco, MO
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Gas vs Diesel

When I pulled my Wildcat 5th wheel with my 2013 GMC 2500HD gas truck I would get around 8 mpg. 7.5 on the hills and 8.5 on the flat. I now pull my same Wildcat with a 2015 GMC 2500HD diesel and get around 11.5 mpg. Same driver, same routes. Missouri to Florida. Very happy with my decision to upgrade to the new diesel truck. Almost 50% improvement and diesel fuel is now cheaper.


Mary & Ted
2016 Silverback 33IK
2015 GMC Sierra 2500HD CrewCab Diesel/Super Glide Hitch
Days camped 09 -53, 10 -56, 11 -57, 12 - 55, 13 - 46, 14 - 50, 15 - 60, 16 -32
7 FROG Rallies (Goshen(4), Charleston, Amana(2))
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mpg, towing

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