wind resistance and mpg

Jacsubi · April 17th, 2008, 11:29 PM

Is it possible rolling the windows down while driving over 55 affects the car in a negative way when pertaining to MPG? I assume that driving insanely fast will add a lot of resistance with the windows rolled down, but would it matter if I was going around 65-70?

MWWarlord · April 17th, 2008, 11:33 PM

I think they covered this on mythbusters. Having the windows down actually does effect MPG. However, you are better off with the windows down than you are with the AC on. However, if you don't mind being hot keeping the windows up will help your MPG.

MWWarlord · April 17th, 2008, 11:35 PM

Interesting side note for anyone who owns a truck...mythbusters also found that driving with your tailgate closed actually gives you better MPG than with it open!

04mustang232 · April 17th, 2008, 11:57 PM

Originally Posted by MWWarlord

Interesting side note for anyone who owns a truck...mythbusters also found that driving with your tailgate closed actually gives you better MPG than with it open!

yea, but they didnt do it with a toneau cover, cause i was shocked about the tailgate thing.

Blainestang · April 18th, 2008, 12:04 AM

It's also important to mention that it would be foolish to ASSUME that every car reacts the same way to rolling the windows down or that every truck responds the same way to having the tailgate up or down.

But yes, your aero will definitely be compromised with the windows down...

And your drag coefficient has a HUGE influence on gas mileage at higher speeds

MWWarlord · April 18th, 2008, 12:39 AM

I'm pretty sure by what I saw on mythbusters that all pickup trucks will get better gas mileage with the tailgate closed.

tsp_2177 · April 18th, 2008, 01:40 AM

knock the back window out!!
no resistance!

MWWarlord · April 18th, 2008, 02:09 AM

I don't need to...I have a vert

.

silvergtstang99 · April 18th, 2008, 02:10 AM

^ So you're a couple of hundred pounts heavier

MWWarlord · April 18th, 2008, 02:27 AM

MWWarlord · April 18th, 2008, 02:28 AM

It's worth it though

.

silvergtstang99 · April 18th, 2008, 02:41 AM

I agree.

shadow5403 · April 18th, 2008, 09:30 AM

Yes having the windows down affects MPG, but like stated above.....having the windows down is better than having the AC on as far as MPG is concerned. And convertibles are just as bad with the top down.....the wind create turbulence in the back seat area. So unless you have a toneau cover and roll you windows up when you have the top down....yur in no better situation than anyone with a coupe.

Stang187 · April 18th, 2008, 10:28 AM

would you get less mileage by having both windows down or 1 window down and other 1 uup at high speeds? haha

shadow5403 · April 18th, 2008, 10:48 AM

keep them both up

April 17th, 2008, 11:29 PM	#1
Jacsubi Regular 2000 V6 Mustang Join Date: May 2007 Location: Lynchburg, VA Posts: 77 iTrader: 1 reviews	wind resistance and mpg Is it possible rolling the windows down while driving over 55 affects the car in a negative way when pertaining to MPG? I assume that driving insanely fast will add a lot of resistance with the windows rolled down, but would it matter if I was going around 65-70?

April 17th, 2008, 11:33 PM	#2
MWWarlord Hardcore Enthusiast 1995 Mustang convertible Join Date: Sep 2007 Location: Richmond, VA Posts: 1,409 iTrader: 0 reviews	I think they covered this on mythbusters. Having the windows down actually does effect MPG. However, you are better off with the windows down than you are with the AC on. However, if you don't mind being hot keeping the windows up will help your MPG. __________________ MWWarlord 1995 Mustang convertible check out my garage for pics and a complete list of mods. http://www.tricktuners.com

April 17th, 2008, 11:35 PM	#3
MWWarlord Hardcore Enthusiast 1995 Mustang convertible Join Date: Sep 2007 Location: Richmond, VA Posts: 1,409 iTrader: 0 reviews	Interesting side note for anyone who owns a truck...mythbusters also found that driving with your tailgate closed actually gives you better MPG than with it open! __________________ MWWarlord 1995 Mustang convertible check out my garage for pics and a complete list of mods. http://www.tricktuners.com

April 18th, 2008, 12:04 AM	#5
Blainestang Regular Join Date: Dec 2007 Location: Tampa, FL Posts: 452 iTrader: 0 reviews	It's also important to mention that it would be foolish to ASSUME that every car reacts the same way to rolling the windows down or that every truck responds the same way to having the tailgate up or down. But yes, your aero will definitely be compromised with the windows down... And your drag coefficient has a HUGE influence on gas mileage at higher speeds __________________ 1993 2.3L Coupe [Motortopia] : Open-Track Project... 216k miles 2000 V6 (Black,5-speed) [Motortopia] : Heads/Cam (EXHAUST CLIP) 2001 Harley Davidson F-150 Acts 16:31

April 18th, 2008, 12:39 AM	#6
MWWarlord Hardcore Enthusiast 1995 Mustang convertible Join Date: Sep 2007 Location: Richmond, VA Posts: 1,409 iTrader: 0 reviews	I'm pretty sure by what I saw on mythbusters that all pickup trucks will get better gas mileage with the tailgate closed. __________________ MWWarlord 1995 Mustang convertible check out my garage for pics and a complete list of mods. http://www.tricktuners.com

April 18th, 2008, 01:40 AM	#7
tsp_2177 Hardcore Enthusiast 2005 Civic GAY! Join Date: Mar 2007 Location: Alabama Posts: 1,868 iTrader: 0 reviews	knock the back window out!! no resistance! __________________ slow car member twinky times two the stangs gone pypes mid muffler catback with their X-pipe In the top 20 cool peoples list on MM potsticker in training

April 18th, 2008, 02:09 AM	#8
MWWarlord Hardcore Enthusiast 1995 Mustang convertible Join Date: Sep 2007 Location: Richmond, VA Posts: 1,409 iTrader: 0 reviews	I don't need to...I have a vert. __________________ MWWarlord 1995 Mustang convertible check out my garage for pics and a complete list of mods. http://www.tricktuners.com

April 18th, 2008, 02:27 AM	#10
MWWarlord Hardcore Enthusiast 1995 Mustang convertible Join Date: Sep 2007 Location: Richmond, VA Posts: 1,409 iTrader: 0 reviews	__________________ MWWarlord 1995 Mustang convertible check out my garage for pics and a complete list of mods. http://www.tricktuners.com

April 18th, 2008, 02:28 AM	#11
MWWarlord Hardcore Enthusiast 1995 Mustang convertible Join Date: Sep 2007 Location: Richmond, VA Posts: 1,409 iTrader: 0 reviews	It's worth it though. __________________ MWWarlord 1995 Mustang convertible check out my garage for pics and a complete list of mods. http://www.tricktuners.com

April 18th, 2008, 09:30 AM	#13
shadow5403 Hardcore Enthusiast Join Date: Oct 2007 Location: PA Posts: 2,037 iTrader: 0 reviews	Yes having the windows down affects MPG, but like stated above.....having the windows down is better than having the AC on as far as MPG is concerned. And convertibles are just as bad with the top down.....the wind create turbulence in the back seat area. So unless you have a toneau cover and roll you windows up when you have the top down....yur in no better situation than anyone with a coupe. __________________

April 18th, 2008, 10:28 AM	#14
Stang187 Enthusiast 2004 Mustang GT Join Date: Jan 2007 Location: Florida Posts: 696 iTrader: 0 reviews	would you get less mileage by having both windows down or 1 window down and other 1 uup at high speeds? haha

April 18th, 2008, 10:48 AM	#15
shadow5403 Hardcore Enthusiast Join Date: Oct 2007 Location: PA Posts: 2,037 iTrader: 0 reviews	keep them both up __________________

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