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MFL
Midwest
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Joined: 11/28/2012
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^^Steve...you are not seriously comparing your old 7.3 diesel with half the HP, and no emissions to your 14 6.7 diesel loaded with emissions, and heavier truck??
I agree, using two identical trucks, that being a little closer to the cab, may make a slight difference, say 0.27 mpg. ![[emoticon]](http://www.rv.net/sharedcontent/cfb/images/smile.gif "smile") My figure CB wrong too?
No offence Steve, just made me smile.
Jerry
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Michelle.S
Western NY till fall, then Sebring, FL
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Joined: 01/11/2011
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My understanding is they can work, BUT you would have to put the whole set-up into a wind tunnel and adjust the Wing to the exact pitch and then it would only be good for that combination. The pitch/angle of the deflector is critical.
2018 Chevy 3500HD High Country Crew Cab DRW, D/A, 2016 Redwood 39MB, Dual AC, Fireplace, Sleep #Bed, Auto Sat Dish, Stack Washer/Dryer, Auto Level Sys, Disk Brakes, Onan Gen, 17.5" "H" tires, MORryde Pin & IS, Comfort Ride, Dual Awnings, Full Body Paint
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pianotuna
Regina, SK, Canada
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Joined: 12/18/2004
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I do have a deflector on the front of the hood on my class c. It does help keep insects off of the windshield. They mainly hit the cab over.
btw it is air TABS not tags.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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Cummins12V98
on the road
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Joined: 06/03/2012
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"btw it is air TABS not tags."
Thanks!
2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"
"HeavyWeight" B&W RVK3600
2016 MobileSuites 39TKSB3 highly "Elited" In the stable
2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD
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C Schomer
Pueblo West, Co.
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Joined: 12/26/2000
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A friend had a deflector on his 93 Dodge ctd pulling a 9600lb high profile 5er. It got him 1 mpg when towing and he lost 1.25 mpg unloaded if he didn’t put it down. I would also like to have 4.10s instead of 3.73s. How’s Tonopah? I retired from PVNGS. I don’t miss it, one bit!
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cj99
Tonopah,AZ
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Joined: 07/14/2006
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C Schomer wrote:A friend had a deflector on his 93 Dodge ctd pulling a 9600lb high profile 5er. It got him 1 mpg when towing and he lost 1.25 mpg unloaded if he didn’t put it down. I would also like to have 4.10s instead of 3.73s. How’s Tonopah? I retired from PVNGS. I don’t miss it, one bit!
Tonopah is hot. Lol , funny I self retired 10 years ago from pvngs (paloverde ) I'm now at TMI 1 doing decommissioning work lol
We stay in Colorado in the summers now and sold our Tonopah house
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StirCrazy
Kamloops, BC, Canada
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Joined: 07/16/2003
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MFL wrote:^^Steve...you are not seriously comparing your old 7.3 diesel with half the HP, and no emissions to your 14 6.7 diesel loaded with emissions, and heavier truck??
I agree, using two identical trucks, that being a little closer to the cab, may make a slight difference, say 0.27 mpg. My figure CB wrong too?
No offence Steve, just made me smile.
Jerry
actualy my old 7.3 had 130 more ftlb of torque and 45 hp more than my 14 f350 , but hey its the only thing I had to compare. one thing I did notice is the older truck took a lot more gas peddel to get up to highway speed but once there it towed like a champ, the newer one out towed the hopped up 7.3 all around especialy in the midrange, but the 7.3 would leave musel cars sitting at the lights wondering what just happened.
the point was that with both truck I also towed a 30 foot trailer and the fuel milage was pretty much the same when towing that and worse than towing a 40 foot 5th wheel. the only thing that changes in both cases is the length of space between the back window of the truck and the front of the unit being towed. the larger this area is the more it allows for a low pressure zone to be formed there inducing drag.
so both my trucks got with in 0.2mpg of each other towing the noral camping trailer, but when I went to the 5th wheel the older truck got 1 mpg better than the new truck with the 5th wheel and almost 2.3 mpg better than when it towed the trailer. the older truck the nose of the 5th wheel was about 1.5 feet off the back window, the new truck it is almost 3.5 to 4 feet off the back window. take it for what its worth but it makes sence. if you add air tabs (yes there ugly, but I wonder if you color matched them how they would look) it disrupts the aire coming over the back of the unit to prevent that low pressure zone from being formed which results in less drag. but to get the maximum benifit you would have to put them at the back of your 5th wheel and on the back of your cab, just to much ugly for most. the deflectors were showen not to be worth the cost on highway tractors, instead things likt the airtabs , flow below, and a few others are actualy worth your money but the biggest gas saving they found was from reducing the space between the back of the cab and the trailer and disrupting the low pressure zone at the back of the trailer.
2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100
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cj99
Tonopah,AZ
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Joined: 07/14/2006
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OK well its installed , here are pictures of it folded up & folded down see shared folder linked :![[image]](https://photos.google.com/share/AF1QipN11NTyN_6NsQaopUNWSOeEKIVGlo5XNw3z6W6zcnu6Jl0B0Y7RVxt7zysAGf2YZw?key=UXJiV0U5Ty1rWVZfa2llbWhHM2ZzUWgxM0ZzY0lR)
link here
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fj12ryder
Platte City, MO
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Joined: 08/19/2003
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It would be interesting to see a side view with the trailer attached, to kind of give an idea of distance from the deflector to the nose of the trailer, and the height comparison.
Howard and Peggy
"Don't Panic"
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cj99
Tonopah,AZ
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Joined: 07/14/2006
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Michelle.S wrote:I have pulled the same unit, 2016 Redwood 39MB that is 43' tip to tale and pushing 20K with a 2011 Duramax 3.73 gears and current 2018 Duramax also with 3.73s, both Duallies. and have averaged between 10 to 11 on both putting 50K miles on the RV
cat scales had me at 29K. just saying
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