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Hey There,

First post but long time member. I am about to get a 3500 SRW CC LB 4X4 SLT. I am wondering what happens to milage when you put a canopy on it. I am especially interested in the Leer 122, or any Range-Rider canopies. Anyone willing to chime in with experience and canopy recommendations or comments on milage, would be appreciated. Keep up the good info. We all learn from it.

James
 

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http://www.dieselplace.com/forum/garageimage.php?do=full&p=4851

I've got a 2004 2500HD, CC,4X4,SB with a cab high Jerico cap. In a couple weeks the cap is getting painted and put on my '06. I really like the cap and have never noticed much of a difference in milage. I haven't taken it off much, but when it does come off the milage goes up about 1/2 mpg and I think thats only because I get rid of the extra weight when I empty my tools out. I've got the side access doors on the cap as well. The side doors are great, and for what I do I wouldn't get a cap without them. I can reach almost the whole bed of the truck without climbing in. The yakima rack on top is very handy too. I put a third crossbar on the cab (snaps onto rain gutter, no drilling) and I can carry 20 foot lengths of pipe or lumber without much hanging over the rear.

good luck with the new truck!
 

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Discussion Starter #3
Hey,

I really need to hear from more Leer, or Range-Rider cap owners. I have heard that, depending on the cap, individual models can kill milage, so I am wanting to get one that has vertually no drag to, if anything help milage. If there are any other brands I am not looking at, let me know.
Thanks again for the help.

James
 

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I run a cab height shell made by AmeriCraft out of Salt Lake City. Very well made and cost right at $1,000 from the rv dealer in Elko, NV. Company offers several different window configurations at no cost or very little added cost. Make sure your dealer who does the install uses some good heavy rubber seals between the cap and the bed rails. Not the adhesive backed foam. It won't do the job right. If you wish to make the bed water and dust proof you'll need to seal your tailgate and the open areas of your stake pockets under the bed rail. If there was any change in fuel mileage after adding the shell it was so small one way or the other that it wasn't noticed. If you do any parking at all in parking decks keep the shell at cab height.
 

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A low drag cap would look like the one below (or even more streamlined), and also have as few seams, gaps or protrusions as possible. ref.: http://www.snugtop.com/wn_02topgun_silverado.htm

Generally, most truck caps increase aerodynamic drag compared to the stock (open bed) configuration. The lowest drag configuration commonly utilized is a rigid bed cover, which reduces drag by over 20%. ref.: http://sitemaker.umich.edu/um.gm.truck

You can add "Airtabs" (as in the photo at right) to the rear of any blunt truck body or cap to reduce aerodynamic drag. ref.: http://www.airtab.com/ -- If you didn't want to glue them to the body itself, you could put them on a strip of metal that would be attached to the back of the body with a few small screws.
 

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