20 Mpg!
New User
Joined: Aug 2007
Posts: 4
Likes: 0
high fuel consumtion
Originally Posted by DAVID'S97F250HD
Check to make sure your exhaust back pressure tube is not plugged, do a search on it, its a tube of the sensor on the right front of the engine and the tube goes into the right manifold.
Lead Driver
Joined: Aug 2006
Posts: 5,259
Likes: 17
From: Gambrills
Originally Posted by tndiesel
I just finished my rear fuel tank and got 355 miles out of it. I still have to drive to the gas station so I'll get a little more.
Elder User
Joined: Jan 2003
Posts: 898
Likes: 0
Originally Posted by Copedawg
I just got 250 on my rear tank (pushing it). How can I get an extra "Franklin" out of it?
Although I don't run the tanks empty very often, I have run them both DRY just to see how far the gage would go before it quit.
Junior User
Joined: May 2007
Posts: 67
Likes: 0
From: Topeka, KS
Just got back from my 1100 mile trip. I got 16 mpg on the way down, running the AC and 75mph. I went and picked up a hard tonneau cover and with the cover, no AC and running 72mph I got a little over 18 mpg and got 330 miles on the rear tank alone.
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Posting Guru
Joined: Sep 2004
Posts: 1,096
Likes: 2
From: Ohio
running a tonneau cover should have had the opposite efect. Anything that covers the bed of a truck effects the aerodynamic pocket that builds ffrom the side of the bed walls just behind the cab. If you ad anything over the rails you essentially load the rear of the truck more (unless you have a craftsman truck series vehicle for a daily driver). That must have been with a tailwind. If you take two trucks IDENTICAL and compare with and without covers, the one without should avg 6 10ths better at highway speed. But the cover does look a lot better....LOL Just some info that I thought I would share.
Junior User
Joined: May 2007
Posts: 67
Likes: 0
From: Topeka, KS
Originally Posted by Todd525
running a tonneau cover should have had the opposite efect. Anything that covers the bed of a truck effects the aerodynamic pocket that builds ffrom the side of the bed walls just behind the cab. If you ad anything over the rails you essentially load the rear of the truck more (unless you have a craftsman truck series vehicle for a daily driver). That must have been with a tailwind. If you take two trucks IDENTICAL and compare with and without covers, the one without should avg 6 10ths better at highway speed. But the cover does look a lot better....LOL Just some info that I thought I would share.
Posting Guru
Joined: Mar 2007
Posts: 1,842
Likes: 2
From: hillsborough nj
Originally Posted by z28kilr
Weird. I have always thought that it would give you better fuel mileage with a tonneau cover. Oh well, if I was worried about getting really good fuel mileage, I wouldn't own my truck!
Elder User
Joined: Dec 2004
Posts: 891
Likes: 1
From: Toulon,Il.
There was a short story in one of the Diesel Power mags that stated a college did a wind tunnel test to try and prove advertising wrong or right. What they found was that a trucks tested had less drag coefficent w tonneauo cover and sum had as much as 8-10% lower. I don't know less drag more MPG. I had one on an extended cab short bed it helped about 2-4tenths.Afrien of mine has 03 CC V10 4x4 LB w/cover on interstate cruise on68 16MPG.
Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
I don't know if it makes a difference or not, but I have a cab-high aluminum camper shell on my truck. I get about 16 mpg with the shell in place. Before I put on the shell, I was getting 15 - 15.5 mpg.
Not very scientific, but I get better mpg WITH the bed covered.
On the mythbusters issue, I was under the impression that the tailgate acted like a parachute, CAUSING the bubble that the air flowed over. I understood it to be a trade-off. Covering the bed was aerodynamically better than not covering the bed.
Not very scientific, but I get better mpg WITH the bed covered.
On the mythbusters issue, I was under the impression that the tailgate acted like a parachute, CAUSING the bubble that the air flowed over. I understood it to be a trade-off. Covering the bed was aerodynamically better than not covering the bed.
