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Tow vehicle roof wind deflectors

From 'Fivers to pintle hooks, and everything in between.

Tow vehicle roof wind deflectors

Unread postby imollison on Sun Oct 18, 2009 11:34 pm

Hi all, am new to the forum and love the information that is here. Makes for great reading during the long winters here in Canada.

I currently own/ drive a 2008 GMC 2500HD gas C/C P/U and tow a 28 foot Denali 5th wheel. Mostly small trips with one longer one every year is all we do for camping and I am wondering if any one has any experience with roof mounted wind deflectors? Both good and bad please.

I am looking at adding a larger aftermarket gas tank, but would really like to use existing items that will help increase the fuel economy side of the equation. I have Airtabs on the back of the unit and do notice a difference with handling and visability while driving in the rain, not sure about mileage yet though.
2009 Denali 5th Wheel 28"LBBS

2008 GMC 2500 HD CC
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Re: Tow vehicle roof wind deflectors

Unread postby cwit on Mon Oct 19, 2009 6:42 am

Welcome aboard. They may work with a TT but on 5er's they are to far away from your camper to work IMHO. :)
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Re: Tow vehicle roof wind deflectors

Unread postby Big Rig Guy on Mon Oct 19, 2009 9:14 am

Putting a air shield could make your fuel mileage worse, due to the air recurilating behind the air shield and then hitting the front of your fiver. It's a hit and miss deal. Slowing down to find your optimum fuel economy is about the best way, thats what I do. 100 k per hour pulling a 40 footer and I get just under 11 mpg. If I put my foot into it reduces dramatically. 90 k would be better, but not in the powerband for the hills.

Better intake system on your truck engine, those helps, same with exhaust. Kn filters etc.
There's a method to the madness, disturb the method and the madness begins.
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