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Old 09-02-2014, 04:29 PM   #11
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The tonneau mpg debate has been going on for quite a while. I noticed no difference the brief period I had one. However, all testing that I have read about shows a tonneau decreases gas mileage.
Here is a consumer report study.
Also, my first trip pulling the camper with the new topper I averaged 9.7 mpg according to the digital readout. Depending on where I am traveling I average 9-12, so no real difference there. I wanted the topper for keeping things dry and (somewhat) secure.
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Old 09-02-2014, 05:29 PM   #12
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I had ordered a canopy for my truck the first day I bought it. Took 2 weeks to get in and while I was waiting I had the bed of my truck sprayed with Armorguard and stainless steel stepbars installed. The big plus was being able to keep things dry especially with the camping gear.
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Old 09-02-2014, 07:27 PM   #13
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Quote:
Originally Posted by nbhybrid View Post
not disagreeing with your calculations but I have never experienced an increase in economy.
With a 3-5 percent increase ,which is quite a bit, you would think manufactures would install them as standard equipment to lower their CAFE level. it would save them millions in penalties
This was hand calculated [not the computer] in the 3 months I didn't have the cover vs. after I installed the cover. 20.5 mpg@60mph without cover, 21.2 consistently after, around the same speed. Obviously lots of variables to consider but I was really curious about how the cover would affect mpg so I paid close attention to it. Of course, one of the variables might be that I don't know how to calculate.
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Old 09-02-2014, 08:46 PM   #14
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me too. darn math!
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Old 09-02-2014, 09:21 PM   #15
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Myth Busters did an economy test with and without tailgates and found that mileage was better with a tailgate. There is probably very little difference with a cap, but when towing a cap can reduce turbulence between the truck and trailer.
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Old 09-03-2014, 08:54 AM   #16
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Myth Busters did an economy test with and without tailgates and found that mileage was better with a tailgate. There is probably very little difference with a cap, but when towing a cap can reduce turbulence between the truck and trailer.
This is where I was going. I can't afford the weight of a cap, but I need a tonneau for other reasons. I would never install it simply for the gas savings, I need to put stuff in my truck as a daily driver that I don't necessarily want exposed to the weather.

So I'm wondering if a tonneau cover will have some effect on the occurrence of turbulence between the truck and trailer since that is where a lot of inefficiencies come from? I know it wouldn't be as effective as a cap, but again, I don't have the weight surplus for a cap.

Really, I'm just curious, I'll find out for myself soon enough, just thought I would jump in here and expand the original discussion.
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