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Old 07-01-2008, 09:32 PM   #1
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doors off better gas mileage???

So, my wife and I were discussing wither or not taking the doors off would increase your gas mileage!

Increase in gas mileage
Less weight better gas mileage
Not having to use the A/C

Decrease in gas mileage
Less aerodynamic?
(But the jeep already lacks in the aerodynamic department)

Just thought it would be fun to pounder this question! And it is a good argument if you want to take the doors off and your wife will not let you!
(This is the old argument that people with trucks have is it better to have the tailgate up or down)

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Old 07-01-2008, 09:44 PM   #2
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I know with my roof down I get blown around by the wind WAY WAY more than with the roof up.
Interestly, MythBusters did a thing about truck tailgates and it was actually more economical to have the gate UP than down.
With all the openings and irregular angles with having the roof down and doors off id say it was much less aerodynamical. And I duno bout yours but my doors weight very little.

But you didnt buy your Jeep for any of those considerations didja?
Drop the top, leave the doors at home and hit the trails!!!

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Old 07-01-2008, 09:47 PM   #3
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EDIT: BLAST! Smeg beat my too it

First of all, it has been proven many times that a truck gets better mileage with the tailgate up, rather than down, and even better mileage with one of those Gator net things.

Anyway, I have never calculated a full tank worth of average MPG with JUST the doors off, but I have done it Hard top, Soft top on with doors, and soft top off/doors off. Keep in mind I have hard doors with roll up windows, and I have a rubicon that has 4.11 gears, heavy MTR tires, and a not very ODish 6spd tranny.

Anyway, light driving, about 17mi commute, hard top on, I get about 17mpg average.

Same driving, same commute, soft top with hard doors, 15mpg.

Again, same driving, same commute, top and doors off, 13mpg.

There is just way too much wind that comes into the vehicle, and the front seats, back seats, tailgate, etc. etc. act as a wall. While it sure if fun having the tops and doors off, you won't be seeing a MPG increase unless you drive it like you stole it with the top on, and drive it easy with it off
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Old 07-01-2008, 09:59 PM   #4
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so are you saying if I take the back seat and the tailgate off the jeep I would get better gas mileage?
I am in a smart ass kind of mood!!!

I just thought this would be funny to kick around, doors off that is.

I dont care so much about gas mileage I get around 18-19mpg on highway and 16mpg around town with the four inch lift. I am really light on the pedal

And my dodge 1500 w/hemi has a tonneau cover and gets 22mpg on highway 16mpg in City got to love the 4 cyl shut off.
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Old 07-01-2008, 10:02 PM   #5
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I brought this up also because of this article

http://www.slate.com/id/2194536/?y=1

about mpg with A/C on versus off

JUST THOUGHT I WOULD PUT A JEEP TWIST TO IT!!!
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Old 07-01-2008, 10:23 PM   #6
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Mythbusters did a special on something like this. They found out that with the AC on and the windows up it got better mileage than windows down and no AC. I imagine the Physics would be about the same for doors on vs. doors off, more nooks and crannies for the wind to catch, the less the mileage would be.
Not that it would stop me from taking mine off. I don't even have AC installed on my Jeep, you should have seen the salesmans face when I said I don't need it.
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Old 07-02-2008, 12:05 AM   #7
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my air conditioning IS taking my doors off haha
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Old 07-02-2008, 01:58 AM   #8
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Originally Posted by debruins View Post
my air conditioning IS taking my doors off haha
says the jeeper with no ac.
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Old 07-07-2008, 09:47 PM   #9
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Quote:
Originally Posted by Tiburon View Post
Mythbusters did a special on something like this. They found out that with the AC on and the windows up it got better mileage than windows down and no AC. I imagine the Physics would be about the same for doors on vs. doors off, more nooks and crannies for the wind to catch, the less the mileage would be.
Not that it would stop me from taking mine off. I don't even have AC installed on my Jeep, you should have seen the salesmans face when I said I don't need it.
lol consumer reports did a test too. Windows down with ac off got better mpg than windows up ac on.

With the doors off on my hard top tj, i need to press the gas like i'm pulling train. Doesnt want to go with out the doors off since the brick is even less aerodynamic this way. No hard mpg numbers however according to this theory i'm pretty sure i will get worse mpg.. the more you press the gas, the more gas you use up...
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Old 07-07-2008, 10:39 PM   #10
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my jeep gets pretty good mileage either way .......in a manner of speaking
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Old 07-08-2008, 12:32 AM   #11
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Originally Posted by Smeghead View Post
MythBusters did a thing about truck tailgates and it was actually more economical to have the gate UP than down.
actually MythBusters "revisited" this myth... its more economical to run with one of the "mesh" style tailgates.
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Old 07-08-2008, 01:01 AM   #12
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Originally Posted by chiro2736 View Post
I brought this up also because of this article

http://www.slate.com/id/2194536/?y=1

about mpg with A/C on versus off

JUST THOUGHT I WOULD PUT A JEEP TWIST TO IT!!!
I agree on this statement from that article "The rule of thumb is to keep the windows down while on city streets, then resort to air conditioning when you hit the highway."

This is what I do most of the time...
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Old 07-08-2008, 01:07 AM   #13
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Originally Posted by LWrangler View Post
I agree on this statement from that article "The rule of thumb is to keep the windows down while on city streets, then resort to air conditioning when you hit the highway."

This is what I do most of the time...
HA! you have AC !?? my AC IS my doors and top off, driving fast, on the highway!

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