I certainly do.

• If I use AC my mpg drops about that much.
• If I put on my roof rack it drops more.
• If I put on my bed topper I gain.
• If I drive in 4Hi I loose about that much.
• If I use ethanol free gas, I show the most gain of all.

Add all these thing up

 

None. Adding a tonneau cover will actually decrease your MPG... Can't talk from my own experience since I don't have a cover, but it's research proven.

 

O fuel mileage increase. Even the Ford F-150 engineer will tell you this.

 

Interesting video - Thanks for posting.

 

It's more about the lack of credible sources, rather than folks trying to elevate Mythbusters. Shortride posted a video that apparently has a Ford engineer stating no mileage increase...

 

2 year old thread resurrected...

 

I read a story a few years ago how they tested things that would increase MPG on semi's. For one thing they measure the fuel used in a very exact manner, not just when the pump shuts off. They also do a test similar to myth busters and drive two indentical trucks over real world roads. The difference they go to a lot of work and testing to make sure the trucks really are the same. They have tested fuel additives, aerodynamic aids this way. One trucks gets the supposed improvement and the other doesn't.

 

All I know is with my Toyota Pickup I get better mileage with the camper shell on it. Tests say one thing but it's noticeable on my truck (1 mpg better)and this has been tested many times over 230,000 miles


All I know is I have a way to secure valuables while out fishing/ hunting and it will keep my gear safe.

 

What wrong with that if it's a viable subject?

 

I thought it was better than posting a new thread....and we got that great Ford video in the wind tunnel which was pretty cool.