How much does driving with the sunroof OPEN hurt gas mileage? - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 23 (permalink) Old 03-08-2009, 10:03 PM Thread Starter
 
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How much does driving with the sunroof OPEN hurt gas mileage?

I drove my 02 Intrepid ES with the sunroof open for the first time this year and I was just wondering how much of a drag is it on fuel efficiency? Anything I can do to counteract the negative effects?

Last edited by Thundersnow; 03-08-2009 at 10:05 PM.
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post #2 of 23 (permalink) Old 03-08-2009, 10:05 PM
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Quote:
Anything I can do to counteract the negative effects?
Close it??
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post #3 of 23 (permalink) Old 03-08-2009, 10:13 PM
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Chances are no but there's only one way to tell.....


Do the math!

Are you doing a road trip soon where you can go tank for tank with the roof open and closed under the same conditions?

Daily in town driving i can't see there being any change.
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post #4 of 23 (permalink) Old 03-08-2009, 10:24 PM
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Close it??
lol
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post #5 of 23 (permalink) Old 03-08-2009, 10:47 PM
 
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Duct Tape??
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post #6 of 23 (permalink) Old 03-08-2009, 11:37 PM
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open all the windows, but seriously why worry over such a small drop in MPG-with conservative driving I was getting 19-21MPG with my sunroof open and all the windows down in the city.
Tom
I have not seen that number in a while,but the crappy winter blend fuel I suspect is the blame
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post #7 of 23 (permalink) Old 03-08-2009, 11:45 PM
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I really don't think there will be that much effect. The only way that MPG will be affected is if somehow air flows into the cabin from the roof. So as long as you don't hold an umbrella outside the sunroof while you drive, then there should be no problem.

Also I think a little smooth rise at the front liek this

/____

can help. But the effect should be minimal. Now a convertible... that's different...
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post #8 of 23 (permalink) Old 03-09-2009, 08:52 AM
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With all the windows down and the sunroof fully open there is very little buffeting, which shows that the air flows fairly smoothly through the car. At highway speeds i usually have the sunroof in the vent position and then crack one of the rear windows about 1/4". Depending on which of the 2 you crack, you can control the direction of the breeze through the car. I prefer to have the rear passenger side down when it's just me in the car. You'll be amazed how much air will move through the car with that combo.
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post #9 of 23 (permalink) Old 03-09-2009, 08:57 PM Thread Starter
 
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open all the windows, but seriously why worry over such a small drop in MPG-with conservative driving I was getting 19-21MPG with my sunroof open and all the windows down in the city.
Tom
I have not seen that number in a while,but the crappy winter blend fuel I suspect is the blame
For those of you that have seen me post here before you'll know my OTIS says I only get about 15.8 MPG or sometimes less than that!! It's as low as 15.3 or so sometimes and that has been with NO sunroof open and ALL windows up!! I never even drove with the sunroof open until just yesterday.

I have the same car that many of you guys have so many of you guys must get fuel efficiency as bad as mine? I have an 02 Intrepid ES with 97K miles.

Last edited by Thundersnow; 03-09-2009 at 09:00 PM.
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post #10 of 23 (permalink) Old 03-09-2009, 09:43 PM
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With all the windows down and the sunroof fully open there is very little buffeting, which shows that the air flows fairly smoothly through the car. At highway speeds i usually have the sunroof in the vent position and then crack one of the rear windows about 1/4". Depending on which of the 2 you crack, you can control the direction of the breeze through the car. I prefer to have the rear passenger side down when it's just me in the car. You'll be amazed how much air will move through the car with that combo.
A wise old girlfriend showed me the flow design, if the driver is warm drop the pass windows an inch or two.

opposite if the passenger wants some air flow!

She showed me other things as well!
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post #11 of 23 (permalink) Old 03-09-2009, 10:09 PM
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I never knew SEs came with sunroof until i saw one today.
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post #12 of 23 (permalink) Old 03-10-2009, 08:55 AM
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A wise old girlfriend showed me the flow design, if the driver is warm drop the pass windows an inch or two.

opposite if the passenger wants some air flow!

She showed me other things as well!
How old was this chick? Did she take her teeth out to show you those "other things"?
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post #13 of 23 (permalink) Old 03-10-2009, 11:45 AM
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32, all her own, never even nibbled!

She interduced me to my now wife!

is what I ment!

Guess i should have said EX!

Joined the 100 MILE PER HOUR club!

enough said ,before the wife sees!
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post #14 of 23 (permalink) Old 03-11-2009, 01:25 PM
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If you have OTIS. Set the cruise on the highway. Reset the average mileage. Drive for about 10 km's. Note reading. Now try it with the roof the other way. Reset and repeat at the same speed. Note the reading. Try this back and forth a few times and come back with the results.

I've done this except I was comparing mileage at different speeds.
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post #15 of 23 (permalink) Old 03-12-2009, 07:43 AM Thread Starter
 
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Originally Posted by jfsram View Post
If you have OTIS. Set the cruise on the highway. Reset the average mileage. Drive for about 10 km's. Note reading. Now try it with the roof the other way. Reset and repeat at the same speed. Note the reading. Try this back and forth a few times and come back with the results.

I've done this except I was comparing mileage at different speeds.
I don't have cruise control.
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