Tonneau Covers
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Tuned
Joined: Sep 2006
Posts: 259
Likes: 1
not to derail this thread but i noticed when i had the bed 3/4 full with stuff the mileage jumped for 2 tank fulls to 13 mpgs.I emptied it out and now the mpgs dropped back to 10.Its a 5.4l sc sb with 3300 miles and 103 hrs on it.I thought that was pretty wierd hence me askin if anyone has a seen a difference.i know every driver is different and every climate is diiferent and who knows what crap they are puttin in gasoline.Just my thought ,any body got any ideas?...
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
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From: Stephensville WI
Originally Posted by PHWLEE
I heard that the design of the truck makes the air funnel behind the cab and over the bed so that the presence (or lack of) of a cover won't make a big difference in fuel economy.
Elder User
Joined: Apr 2006
Posts: 804
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From: Edmonton, AB
Originally Posted by conger
Hey Duffman, I was looking for a roll away as well. Where did you get it and how much? Some I've seen are more than a grand.
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Tuned
Joined: Sep 2006
Posts: 259
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Everyone i ask around locally says that they seen mythbusters and that it proves that tonneaus wont help mileage .My reply is that 1.That test was performed on a totally redesigned truck, a 150, where the SD have just had minor changes for the past 8 model years.2.These are just two different animals im sure if you wind tunneled both trucks there would be a difference between them.Im not an expert just my opinion .
Elder User
Joined: Apr 2006
Posts: 804
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From: Edmonton, AB
Originally Posted by conger
No, didn't get it yet. I've been looking around Edmonton, but I don't want to pay $1100 for one.
Tuned
Joined: Jun 2006
Posts: 453
Likes: 1
From: Montana
I don't know but the way they showed the airflow over the cab with the fishtank model I would think with a longer bed the tailgate is further from the cab to allow more air getting trapped in the bed. But it would be a good one to see of course it doesnt affect me none I know the flatbed dropped mine at least 2 mpg.
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Senior User
Joined: Oct 2005
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The problem with all these tests is that airflow is totally different at changing speeds. An airfoil on the decklid on any race car will create downforce at one speed, and can actually lessen at higher speeds due to the effect of the air moving over the roof of the car.
Scale models to show airflow is also a joke. Air itself is a constant mass with constant flow qualities. Unless you can find 1/8 scale air, you will not be able to predict diddly squat with your 1/8 scale car.
Put it to you this way - If you could use mini scale models to predict airflow, then why don't you see plastic miniature heads and intakes to predict port modifications on a flowbench?
Scale models to show airflow is also a joke. Air itself is a constant mass with constant flow qualities. Unless you can find 1/8 scale air, you will not be able to predict diddly squat with your 1/8 scale car.
Put it to you this way - If you could use mini scale models to predict airflow, then why don't you see plastic miniature heads and intakes to predict port modifications on a flowbench?
Posting Guru
Joined: May 2006
Posts: 1,028
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From: Edmonton, AB.
Originally Posted by duffman77
I tried again today, it shows up in my sent messages so I am sure you will get it this time.
New User
Joined: Oct 2006
Posts: 9
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Pace Edwards Full-Metal JackRabbit what I got for my 2007 F250 SD and I love it! It's secure and super easy to install (no drilling). Fits flush with the bed of truck and looks great too. The cost is well worth it for a top that will last for years and it comes with a 3yr warranty all others are only 1.
Hotshot
Joined: Apr 2004
Posts: 13,589
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From: NW burbs of chicago
Originally Posted by SME
Anybody use the Undercover tonneaus covers? I priced them from two different dealers in my area from about $750 to $850. Just wondering about quality and durability.
Try one of these . . .
Junior User
Joined: Feb 2006
Posts: 63
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Myth Busters episode
I think what the Myth Busters episode proved is that there are a lot of variables depending on the configuration of the truck and that and claims of better gas mileage are suspect depending on said configuration! If there weren’t a lot of variables they wouldn’t have had to do two shows on the same subject showing different results in each!
New User
Joined: Jan 2007
Posts: 21
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Originally Posted by cous261
Pace Edwards Full-Metal JackRabbit what I got for my 2007 F250 SD and I love it! It's secure and super easy to install (no drilling). Fits flush with the bed of truck and looks great too. The cost is well worth it for a top that will last for years and it comes with a 3yr warranty all others are only 1.