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Tonneaus covers - mileage? waterproof?

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Old 03-01-2013, 05:11 PM   #1
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Tonneaus covers - mileage? waterproof?

I am looking at hard tri-fold tonneaus comvers and would like to hear opinions on gas mileage improvement as most of the literature claims this. Also, is your tri-fold actually waterproof?

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Old 03-01-2013, 05:19 PM   #2
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No manufacturer guarantees their cover to be water proof. Certainly some designs do better than others. Small amounts of water is absolutely normal.

Mileage from a tonneau is another stretch. How do you drive, are you towing, whats the weather, vehicle maintenance, etc can all impact that. IIRC, Mythbusters did some tests and found a variance of a few tenths of a mile gain.
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Old 03-01-2013, 07:01 PM   #3
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My extang trifecta is about 98% waterproof, not sure on the mileage improvements
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Old 03-01-2013, 07:14 PM   #4
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My Advantage tri fold doesn't even leak going through the carwash. Don't know about the effect on mileage though.
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Old 03-01-2013, 07:18 PM   #5
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according to results by mythbusters the tailgate net provides most mpg gain
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Old 03-01-2013, 07:29 PM   #6
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My Extang Express cover is really easy to install and holds up to car washes with no leaking. I did put a thicker weatherseal at the front to keep out water. I also had to modify the mounting rail to allow use of the rail tie-downs.
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Old 03-01-2013, 07:41 PM   #7
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"Water resistant" is usually the terminology used. I saw zero gain or loss of mpg with mine.
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Old 06-16-2013, 10:15 AM   #8
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my extang trifold leak like crazy... the weather stripping are garbage, need to change them every 6 month look like
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