NanciL
Bakersville, NC, USA
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Joined: 03/24/2003
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From some experience:
Six years ago I pulled our trailer from NC to Alaska and back with two kayaks on the roof, and I was averaging between 9 and 10 MPG.
In the past few years using the same truck and trailer but with the addition of a canoe between the two kayaks, heading to and from Florida, (which is much flatter) I only get between 8 and 9 MPg.
There are a lot of variables which can affect the mileage, and in my case a couple of possibilities are:
1. the truck was new then and possibly tuned better
2. On the AK trip the two kayaks were lying flat on saddles where now they are sideways on J cradles
But as you can see, the canoe sure isn't helping.
Your exact same question was asked on "Paddling.net" a few weeks ago, by someone that thought they got a bit better MPG with a canoe on their vehicle roof than without it on, (no trailer involved) and all the answers came back with a "no" or a few sarcastic answers like you got here.
Jack L
Jack & Nanci
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shum02
Burlington, Ontario Canada
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Joined: 04/22/2005
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Two years of a canoe on the roof of my F150 and it doesn't make a lick of difference good or bad. Same mileage. There is NO magic bullet.
2007 F150 XLT CC 4x4 5.4L 3.73LS
2007 KZ2505QSS-F Outdoorsman
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lotust
Long Island NY
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biskit4camping wrote:Yeah, lotust... This is a serious question... and a serious thread.
Please enlighten us unwashed masses.
Lighten up please as others have said allready. 
- 2000 23' Flagstaff forest River Ultra light.
2008 toyota tundra 5.7L w/tow Off road Pkg.
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The wife and the dog.
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nowgrn4
Tampa,Fl.
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biskit4camping,good question.Please revisit this thread and let us know what changes in mileage you find.
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pmfinnegan2
S.E. Michigan
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Honestly I did get about a 1.5 mpg improvement with my canoe up on my roof while I was towing my previous TT. I have not tried with my current TT.
pmfinnegan2
1998 Dodge Ram 1500 Sport
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Essie2Go
Canada
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Joined: 04/18/2008
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We have a small aerodynamic trailer and find that our kevlar canoe does seem to make a difference in mileage. But unlike the earlier picture our canoe is almost at the height of the trailer.
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joebloe
Rockford, Illinois
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We used to mount a canoe on my last TV. It fit just right so that we could open the sunroof. The gale being forced over the roof of the car by the hollowed out boat seemed enough to rip your hand off. I don't know what kind of aerodynamic advantages the top of the canoe offer, but the bottom offer none at all unless you can fill in the canoe with an air bladder and hard seal it to the roof.
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SpoiledRotten
Central Mississippi
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A car in a conoe will yeild even better mileage. 
Just the 3 of us...SpoiledRotten, TotallyRotten, and ALittleRotten
2000 F-250 Lariat, CC
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JJBIRISH
Butler, PA, USA
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Joined: 10/06/2002
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if I got better mileage with a boat on the roof, and was certain that was the reason... I would weld it there so no one could move it...
the only mod with measurable change I have seen is to put a wood block under the gas pedal...
Love my mass produced, entry level, built by Lazy American Workers, Hornet
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colochoclab
Arvada, Colorado
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He! He!
Send this one to "Mythbusters"!
-Lab
2008 Nissan Titan LE Crew 4x4, DOHC 5.6 V8 w/VVT, Big Tow Pkg.
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"I asked God for a true friend: He sent me a Labrador Retriever."
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