Roof Racks and MPG
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RE: Roof Racks and MPG - 5/28/2008 5:28:22 AM
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Gunz
Posts: 140
Joined: 11/12/2007
From: Havelock NC
Status: offline
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I do not have a roof rack (yet) on my H3. I did have them on all my Land Rovers and yes they cut the gas mileage down considerably. I cannot say by 5 MPG but I would say yes to 3. Take it off and see what happens. I got 20 plus on the highway in my H3 then I raised the front end (leveled) and I lost 2 MPG! So I gess the more you do the more you suffer at the pump!
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"Freedom isn't Free"
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RE: Roof Racks and MPG - 5/28/2008 5:38:44 AM
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D VADER
Posts: 1197
Joined: 5/21/2007
Status: offline
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I dropped my H3 by 3" at the corners so my elderly Mother could get in. I imagine that should help my MPG also. I improved the intake and exhaust plus a PCM tune. I need to check my MPG so I can see where I'm at. But I think 20mpg would be a stretch for me.
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2007 H3X w/lux pkg, black on black, Starship from the "Dark Side"
Central Ohio
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RE: Roof Racks and MPG - 5/29/2008 6:49:50 AM
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rhill20
Posts: 4549
Joined: 10/27/2007
From: Delaware, Ohio GO BUCKS!
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Anything that adds "drag" to the truck is going to affect the MPG. That's alot though. I don't have one on my 3 but my wife has the OEM cross bars on hers. No difference that I can tell. Of course they are pretty streamlined and light. It was posted in the FAQ's section at the top of the H3 section about brushguards. I believe someone quoted that for every 100 lbs you add you lose 1 MPG. IDK, I don't have enough on mine to start dropping enough weight to make a difference.
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RE: Roof Racks and MPG - 5/29/2008 6:57:54 AM
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RealJeep
Posts: 725
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As has been stated on here many times by many guys, "It's hard to make a brick aerodynamic." Your H3 is build like a brick, it gets the fuel mileage of a brick and just about any weight you add to it or anything you put on it might affect mileage. Some roof racks, like the ones I had on my Ford Explorer, did not adversely affect mileage because they were shaped like a wing and when they were cutting through the air they acted like a foil flowing the air across the top of the truck and not creating a vortex. Some changes are good!
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RE: Roof Racks and MPG - 5/29/2008 3:33:03 PM
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Evadd
Posts: 69
Joined: 2/22/2008
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quote:
ORIGINAL: RealJeep
As has been stated on here many times by many guys, "It's hard to make a brick aerodynamic." Your H3 is build like a brick, it gets the fuel mileage of a brick and just about any weight you add to it or anything you put on it might affect mileage. Some roof racks, like the ones I had on my Ford Explorer, did not adversely affect mileage because they were shaped like a wing and when they were cutting through the air they acted like a foil flowing the air across the top of the truck and not creating a vortex. Some changes are good!
i agree. i think on a more aerodynamic car like the Camry they used that you will see a much larger effect from something like roof racks than on a car that has crap aerodynamics to begin with.
anywho, as a starting point, i have roof cross bars and nerf bars/side step bars and get 18mpg, about 1/2 highway and 1/2 city (consistently by my own calculations over several trips to the pump). mind you, i drive very conservatively - slow on the gas and the brake, with coasting whenever feasible. highway speed averages 65-70.
< Message edited by Evadd -- 5/29/2008 3:41:25 PM >
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