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  #1  
Old 01-13-2014, 01:54 AM
Carmasdad Carmasdad is offline
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Default Do bed covers increase mpg???

I'm thinking about getting one but the Internet tells me both ways some say no effect others say worse mpg others say better? Info from someone that knows would be great thanks
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  #2  
Old 01-13-2014, 03:25 AM
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MythBusters did a test a couple years ago

People are still unsure

https://www.google.com/#q=mythbusters+tailgate+results
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  #3  
Old 01-13-2014, 08:01 AM
Hemi HFE Hemi HFE is offline
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Tonneau covers Definitely improve (reduce) a pickup trucks aerodynamic drag coefficient (Cd),
and will therefore reduce the road load horsepower,
and will therefore improve fuel economy.

GREAT paper here on pickup aero and possible improvements,
along with the computational detail to simulate vehicle aerodynamics,
and offers these results:
"....pickup truck fitted with Tonneau cover has reduction of aerodynamic drag coefficient by 1.16% and of lift coefficient by 6.64% when compared with the baseline truck model."
http://csus-dspace.calstate.edu/hand.../169?show=full

The GMC XFE package includes a tonneau,
GM engineers estimating 0.1-0.2mpg for that mod.. see
http://www.motortrend.com/features/c...s/viewall.html

For the Ram, the only thing I found was a 0.8% Cd reduction claim at
http://www.allpar.com/model/ram/2013-ram.html

Also as anecdotal evidence -
since I can't find any 'official' Ram press stating specifically FE gains from the tonneau -
only that it 'improves aerodynamics' ..,
witness the 2013 RAM HFE package which has the tri-fold tonneau as standard equipment...
http://www.hybridcars.com/2014-ram-1...stem-overview/

also, for aero, a 'hard' tonneau is slightly better than a 'soft' ..
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Old 01-13-2014, 08:58 AM
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I think if they made a significant increase in mileage, they would be on every truck from the factory. It would be an easy way for a manufacturer to raise their fleet mpg ratings.
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Old 01-13-2014, 09:01 AM
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Quote:
Originally Posted by GTyankee View Post
MythBusters did a test a couple years ago

People are still unsure

https://www.google.com/#q=mythbusters+tailgate+results
yup, saw that episode a few years ago too
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Old 01-13-2014, 09:08 AM
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I've had bed covers on the last 3 trucks and I have not realized any difference in fuel mileage with the cover verses without. If there is any mpg improvement, it's very insignificant.
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Old 01-13-2014, 09:13 AM
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Only reason to get a bed cover is for need and/or for looks.
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Old 01-13-2014, 10:49 AM
Hemi HFE Hemi HFE is offline
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Quote:
Originally Posted by Two Dog View Post
I think if they made a significant increase in mileage, they would be on every truck from the factory. It would be an easy way for a manufacturer to raise their fleet mpg ratings.
'Easy' because it's simple to add to the truck, Yes.

But there are MANY other factors determining whether/not a particular engineering improvement is incorporated into a new vehicle design, or standard equipment.

The First is Obviously COST.

If the OEM can get that mpg (or performance, or NVH, or ...) improvement another way, for less $,
then that other way (generally) gets done first.

Second - If you make the tonneau cover Standard,
what do you do with the HUNDREDS OF THOUSANDS of buyers who do not want that option?

That is why it's only Standard on the High Fuel Economy HFE package..
and Optional on the rest of the Ram line-up.

While I respect "I tried <modification> and it didnt work" replies,
please realize that is No Substitute for Real Testing involving wind tunnels, engine and chassis dynamometers, EPA certified fuel economy tests, etc.

Trust me, I spent 5 years doing fuel economy and performance modelling for Ford's Advanced Vehicle Technology;
I understand exactly *all* the vehicle level contributions to fuel economy and performance.

And, I've always advocated *for the customer* in the arguments of Engineering (us) Vs. Accounting/Marketing (them)...
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Old 01-13-2014, 12:12 PM
Two Dog Two Dog is offline
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Default

Quote:
Originally Posted by Hemi HFE View Post
'Easy' because it's simple to add to the truck, Yes.

But there are MANY other factors determining whether/not a particular engineering improvement is incorporated into a new vehicle design, or standard equipment.

The First is Obviously COST.

If the OEM can get that mpg (or performance, or NVH, or ...) improvement another way, for less $,
then that other way (generally) gets done first.

Second - If you make the tonneau cover Standard,
what do you do with the HUNDREDS OF THOUSANDS of buyers who do not want that option?

That is why it's only Standard on the High Fuel Economy HFE package..
and Optional on the rest of the Ram line-up.

While I respect "I tried <modification> and it didnt work" replies,
please realize that is No Substitute for Real Testing involving wind tunnels, engine and chassis dynamometers, EPA certified fuel economy tests, etc.

Trust me, I spent 5 years doing fuel economy and performance modelling for Ford's Advanced Vehicle Technology;
I understand exactly *all* the vehicle level contributions to fuel economy and performance.

And, I've always advocated *for the customer* in the arguments of Engineering (us) Vs. Accounting/Marketing (them)...

The cost of a tonneau is negligible, not much r&d to go into that one. Manufacturing cost is cheap too. If in fact, they did raise your mpg even by 1 mpg, that would be substantial. .1 mpg that's it? Removing the whip antennae would probably do the same thing.

If you got one and didn't like it? Do what almost everyone in this forum does, customize your ride and take it off. Just like the countless factory air intakes that people toss aside, even though there is nothing wrong with them, and are most likely superior to the replacement.

If there were quick easy fixes for extended mileage, I'm sure the auto industry would be all over them, probably even the EPA.
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Old 01-13-2014, 12:15 PM
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Default

Probably not a difference that you will notice.
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