Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > 5th Wheel Discussion
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 02-01-2016, 01:49 PM   #15
Senior Member
jacknife's Avatar
Join Date: Sep 2013
Posts: 496
Look at the semi trls alot have foldable extensions to reduce turbulance.

jacknife is online now   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 02-02-2016, 08:27 PM   #16
Senior Member
wingnut60's Avatar
Join Date: Aug 2004
Location: Burleson, TX
Posts: 2,352
Have seen a lot of effort put into getting just tenths/mpg improvement for the truckers--if we drove hundreds of thousands of miles with a fleet of trucks, it does add up. For a fiver, don't think it could ever be proven to be worth the effort.
If it was that easy to get mpg improvements, every pickup towing a fiver would have an air foil on top...including mine. And stability with my setup isn't a problem.
Good conversation tho, never know when something might come up that makes a real difference.

'05 36TK3 Mobile Suites
'10 F450 new to me
'09 F450 Lariat 4x4--died
wingnut60 is offline   Reply With Quote
Old 02-09-2016, 08:57 PM   #17
Join Date: Sep 2015
Posts: 37
I can tell you with certainty that air tabs don't work, and none of the above claimed 5.5% the key is in the wording "up to" 5.5% which includes 0. Big rigs with side plates and underbelly deflectors save about 4500/yr in OTR long haul trucks. Based on fuel price and the fact they put on more a year that 10 with your RV. You need an absolute ton of miles to see the decimal point increase in drag's effectiveness. I had bigger gains in fuel economy in my big rigs and in my RV simply by running Amsoil synthetic oil, not to mention reduced maintenance and drivetrain wear. Keep your air cleaner clean and run injector cleaner in those diesels, make sure your tires are up to pressure and all joking aside keep your rig clean and waxed and you will see point % gains again. There are no miracle cures for anything out there and the old adage that if it sounds too good to be true it is, there's a sucker born every minute, and a fool and his money are soon parted all bear truth sadly. It's all about it the little things you can do to add up to realitively small gains but gains none the less and they don't really cost much.
2015 Cougar 313 Polar Pack 5er
2nd unit: 12' enclosed for the Harley
Yanking it all with a seriously modified 2000 F350 Dually
DieselGod is offline   Reply With Quote
Old 02-09-2016, 09:00 PM   #18
Senior Member
wingnut60's Avatar
Join Date: Aug 2004
Location: Burleson, TX
Posts: 2,352
Just got to thinking...didn't all the old Shasta trailers have their version of the 'airfoil' on them?
'05 36TK3 Mobile Suites
'10 F450 new to me
'09 F450 Lariat 4x4--died
wingnut60 is offline   Reply With Quote
Old 02-09-2016, 09:45 PM   #19
Join Date: Jul 2002
Posts: 66
Rear caps look great but I doubt the average RV'er could see much fuel savings from one if there are any to be had. They just don't rack up enough mileage to make much difference.
Wilber1 is offline   Reply With Quote
Old 02-10-2016, 07:25 AM   #20
Senior Member
IC2's Avatar
Join Date: Jun 2010
Location: Upstate New York
Posts: 1,305
The now gone 33' Titanium had a rear cap and really looked nice. My fuel mileage was 12-13. The current 38' and heavier Montana doesn't and my fuel mileage is ta-da!! 12-13.

When I asked an honest (an oxymoron?) RV salesman why many premium 5ers no longer had the molded rear cap, his answer was money - the cost of manufacturing and the sell price, no other reason. Some do offer a rear cap at about a $2K adder which will, at current diesel prices, put 1000 gallons of fuel in the TVs tank, or figured at 13mpg, 13,000 miles
Dave W along with my DW, Susan and our poodlepups, Callie & Molly,2011 Ford F250 6.7 CCLB, 5er Hitch Option w/B&W Hitch,,Ride Rite air bags, 2014 Montana High Country 343RL (38')
IC2 is offline   Reply With Quote
Old 02-13-2016, 09:50 PM   #21
Join Date: Mar 2009
Posts: 31
I ran one of the folding tail spoilers on my big rig for 450000 miles, just over 3 years and it saved me $800.00 in round numbers over the course of those 3 years. It cost quite a bit more than that to purchase, install and maintain. I no longer have it. The underbelly skirts on the other hand did help and surprisingly added stability in cross wind situations, probably by preventing air under the trailer from trying to lift it like ground effect skirting on a race car.

renegade is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gauges Fuel and Rear air tank charlie2 Class A Motorhome Discussions 6 12-05-2015 02:11 PM
Fuel line to Gen Issue Airthug RV Systems & Appliances 7 11-25-2015 01:04 AM
Fuel, discounts, savings etc.. Lloyd in S.C. Class A Motorhome Discussions 8 06-07-2015 02:01 PM
Locking fuel cap for National diesels mbrandt1402 National RV Owner's Forum 1 02-21-2015 07:39 PM
Locking fuel cap GeoRuple Freightliner Motorhome Chassis Forum 9 01-08-2015 11:08 AM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:39 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.