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  #21  
Old 08-01-2013, 09:06 AM
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Myth busters drove the same route with identical trucks and ran them until one of them ran out of gas. Maybe not exact science, but it pretty much backs up the results that were already out there. This was the espisode with the tailgate down or tailgate up. I didn't see the one with bed covers, the mesh tailgates etc, but I did read about it.
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  #22  
Old 08-01-2013, 10:24 AM
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The myth of driving with tail gate lowered or using a tonneau cover to increase MPG has been repeatedly found to be FALSE. Many studies have shown no advantage to either.

You increase your MPG by learning how to drive, developing driving skill and patience.
Also, fill up in the cool of the morning for the most fuel pumped per gallon. (Cool fuel is more dense). Getting more fuel for every dollar increases your driving economy.
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  #23  
Old 08-01-2013, 10:44 AM
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I've read the cool fuel thing also, its true, but it makes such a small difference its not worth worrying about.
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  #24  
Old 08-01-2013, 11:29 AM
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Quote:
Originally Posted by skytop View Post
The myth of driving with tail gate lowered or using a tonneau cover to increase MPG has been repeatedly found to be FALSE. Many studies have shown no advantage to either.

You increase your MPG by learning how to drive, developing driving skill and patience.
Also, fill up in the cool of the morning for the most fuel pumped per gallon. (Cool fuel is more dense). Getting more fuel for every dollar increases your driving economy.
all true, but i find it almost impossible to drive for mpg all the time. not with a hemi .
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  #25  
Old 08-01-2013, 11:32 AM
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Quote:
Originally Posted by dodge man View Post
Myth busters drove the same route with identical trucks...
That right there is garbage/inaccurate science. Looks good on TV though to the majoraty of people who wouldn't have the critical thinking skills to see around the snake oil.

Two identical vehicles would produce the same results, in theory, however that isn't the case by any means. Differing allgnments, and measurements down to the thousandth of an inch can and will make a difference! I'm talking about the ENTIRE power train here. This is also why manufacuters have a tolerance on MPG and pretty much everything else within a product.

The appropriate way to do this test would have been to run a single vehicle without a cover, then reset the test with a cover. The variable would have been, for the most part, removed from the equasion.
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  #26  
Old 08-01-2013, 12:02 PM
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I would think the only way to definitively measure the effects of cover vs no cover would be a full scale model in a controlled environment. mount the truck in a wind tunnel and specifically measure the coefficient of drag on the thing in various configurations. in theory that should kill the argument once and for all.

But then again, where would internet forums be without arguments?

I've found the very best improvement to MPG is tailgating. Only thing is that some of those yuppies in oversized grocery getters get real tense when all they can see is the top of your hood. For some reason they all think I am trying to run them over or something....Semi drivers tend to do that darn weave thing that kicks rocks up everywhere too. You would think that driving that rig 8 hours a day everyday - they'd be able to control it better, sheesh, what a bunch of bad drivers....but I've learned about 6 different forms of sign language in the process, so it's all good!
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Last edited by anothernewb; 08-01-2013 at 12:06 PM.
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  #27  
Old 08-01-2013, 04:23 PM
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I read an article on how they test fuel mileage claims in a very precise manner. This was for big rigs but would apply to any vehicle. First off they have the equipment to measure the amount of fuel used in an exact manner. Second they get two rigs that are exactly the same. Then they run the two rigs over the same route at the same time and get a baseline to make sure the rigs are the same. Then the make a change to one, maybe something as simple as a fuel additive, and run the same route again. You have seen the big rigs with the side skirts? I'm sure they didn't just put those things on with a whim but actually tested them carefully. This was how they determined what actually helps with fuel usage on the big rigs. Think of these big fleets and how much fuel they use. If some additive or magic gizmo would actually increase fuel mileage 1% they would use it.

Did Myth Busters do this exact of testing? I don't think so. I only saw the episode where they ran one truck with the tailgate up and the other with the tailgate down. The one with the tailgate down ran out of gas first. Yeah, I know, maybe they weren't really identical, but I read a pretty detailed report from Ford where they also determined an open bed with a tailgate up gets the best fuel economy, so I bought into the Myth Busters thing.
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  #28  
Old 08-01-2013, 05:53 PM
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most likely junk science. does not negate the fact that no one who has installed the cover has posted an increase in mpg.
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  #29  
Old 08-02-2013, 08:09 PM
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Not sure if most responders looked at this link in my original post.

http://www.tonneau-covers-online.com...%20Savings.pdf

I know it sounds like an ad for tonneau covers but it is a study done in wind tunnels of several different covers on Ram, Ford and Chevy pickup trucks.

It is an interesting read.
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  #30  
Old 08-02-2013, 10:01 PM
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interesting read, but with new shapes on current trucks, i would question if the results are still applicable.
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