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Old 05-07-2012, 10:41 AM   #15
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2008 F-450 6.4L twin turbo, auto w/4.88 gears, H&S tuned 580hp/1175tq at the tires, 6" lift with 36" tires. All figs are hand calculated over various trips: 19.5+ mpg @ 58mph empty, 13mpg @ 70mph empty.
2008 Cyclone 4012 toy hauler usually weighing in over 18,000 lbs, 8.5 mpg towing @ 55mph, and 9.5 towing @ 63mph go figure! Hills are NOT an issue! And with 158 gallons of diesel on board neither is fuel until we stop! :(

Custom 2008 F-450 tuned to 580hp/1175tq at the tires.
2011 Enduramax 3950END set up to play.
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Old 05-31-2012, 07:43 AM   #16
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5ver TH mileage

40' Keystone Fuzion 383 being pulled by an 07 Silv classic HD2500 CC Dura 4wd. Bullydog GT (set on Tow/Econ), 4" cat-back exaust, cold air intake, extra 45 gal fuel tank in bed. Fully loaded with with my Yamaha Royal Star dresser and small motorcycle cargo trailer, full tanks of diesel and gas in the fuel station (15gal) and the bike (6 gal), no water. GVWR was 24,200 as of yesterday on cert. scale. I got 12 mpg steady from Yuma to Bullhead City running 58 mph avg. I'm a bit over on my GVWR, but it's all fuel, which accounts for about 600 lbs. Nothing I can do about that. The ol' lady won't let me throw out any of her stuff....and of course I'm NOT leaving my bike, so I'll live with the extra weight. LMAO

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Old 09-17-2012, 06:18 PM   #17
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40' Fuzion FWTH - 14.4k fully loaded (no water) - 2007 Chev HD2500 4wd 6.6 Dura LBZ/Allison with a Bullydog GT, 4" cat back exaust, cold air intake, EGR blocking plate (and fingerstick), pcv re-route, extra 45 gal fuel tank in bed. Solid 12 mpg - 13-14 on a good day. Never under 11. Buddy of mine has the full Banks system, ECM program, CAI, 5 in turbo back exaust, (no kitty), larger inter-cooler on his Dodge Ram duelee. Cost him about 2k to do it all but he gets a solid 17 pulling a 39 ft Big Country......jerk
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Old 09-17-2012, 06:32 PM   #18
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Maybe 10 mpg or slightly over and down to 8 or 9 in the hills. Also depends on how fast you drive. I am assuming 65 mph as a tops.

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Old 09-17-2012, 08:55 PM   #19
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08 F450,4.88's.Pulling heavy and uphill,6to 8 mpg,open flats 9to 11.So much depends on what time I get out of work and how fast I want to be camping.Speed and headwinds are major factors also..
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Old 11-02-2012, 08:26 AM   #20
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2008 Ford F350 with the 6.4 diesel known for poor mileage
pulling a 42 foot Open Range total weight 23,500 loaded I
get 8.5 mph going about 62 mph.
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Old 11-11-2012, 08:28 AM   #21
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I get 8 mpg pulling 37 ft toy hauler with a F-350 DRW auto 7.3 410 rear
65 mph or 75 mph upgrade air filter.
2008 Mobile Suite 36RE3
2014 CC, DRW Dodge 6.7 Cummings
B&W Companion 5th wheel
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Old 11-14-2012, 10:08 PM   #22
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'07 HD2500 4WD Dura 6.6 LBZ - AFS cold air intake - Bullydog GT programmer (set on "tow/econ") - 4" cat back exaust - exaust manifold changed out on driver side to get rid of the stock "crimp" - towing a 40' Fuzion 383 FWTH fully loaded (no water) is 14.4k. At 60mph CC on relatively level highway I get 13 on a good day, 10 on a reg basis. It'll tow mucho faster, but mileage goes in the s--tter over 65 mph. Towed this rig all over the western and mid-wester US. Same MPG just about everwhere on level ground with no head-wind.
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Old 11-18-2012, 03:07 PM   #23
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I have gotten as much as 12 mpg and as little as 7.5 against a very strong head wind. Most of the time I get 10.5 I have a F350 dually 6.7 diesel pulling a Voltage 3950.
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Old 11-22-2012, 10:08 PM   #24
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I average 9 MPG with my very heavy toy hauler.
David W. Gray - RV Safety Educator and Consultant at Fifth Wheel Street.
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Old 01-07-2013, 09:11 PM   #25
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10+ with an '06 Quadcab. Averaging 60 mph. That's grossing 28k lbs on a Cat scale at a truck stop. The trailer was a an '06 Skyline Rampage 387. I have a totally different rig now,...so will post when I find out what it is.
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Old 04-14-2013, 07:27 PM   #26
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2012 F-450 (6.7 Diesel/ 4:10 gears) pulling a 44' Voltage Toy Hauler loaded. 8-9 mpg with cruise set at 65.
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Old 04-16-2013, 06:16 AM   #27
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2013 F350 6.7 DRW, just turned 5K, pulling Cyclone 4100 (43', 18K). I just returned from Big Bend area with hills all the way. Fully loaded, 80 gal water, with a 1700 lb 4 x 4 Mule and a full sized Weber gas grill in the garage. Headed out we had a quartering headwind, 6.5 mpg. Coming home, no water, strong tail wind, 65 mph, 10 mpg
Scotty and Kristen, Airedales Dagny and Wyatt
2007 Newmar Mountain Aire 4528, 450 HP ISM, Allison 4000, 8 Trojan T-105's
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Old 06-29-2013, 04:09 AM   #28
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Komfort Karry-All 36ft 16,000...2002 Dodge CTD Auto 3.52? Gears = 5.8 mpg...same RV F350 6.0L TD 3.73 gears = 6.8 mpg...same RV Sportchassis 7.2L M906 6 Auto Mercedes = 7.5 windy to 9 mpg no wind...sometimes I do weight in at 16,800 to 17,000 if I have two Quads and the RZR in the toy box...

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