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Re: Windows Down?
Posted by ursaw (more from ursaw) on Thu, 29 May 2008 21:17:37
In Reply to: Windows Down?, Jonathan Scupin
[Profile/Gallery]
, Thu, 29 May 2008 17:30:31
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Actually I just did that last week. No A/C Windows up and was at 32.8. Problem is right now I don't yet have a good baseline for mileage with ethanol blend fuel in summer so really have nothing valid to compare it. Also ~ half the tank was old winter gas as I have driven the car very little over last few months; not sure if the formulation really is an issue but a consideration.
My personal choice on the interstate is driver's window all the way down (maybe less than all the way in cooler weather) and rear window down part way to elimiate wind buffeting. Among modern cars the 9-5 is rather good for window down driving (at least from driver's seat) in such a configuration.
Only if it is really hot do I prefer A/C. Here is the crazy thing, although I never did a legitimate average, it always seemed like my average per the SID declined with windows up and A/C on. Now personally I am only going to turn it on if it is really hot and humid so it is working extra hard and I'll often then turn it off and try the windows down again so it isn't typical A/C usage or conditions. I told myself this was probably my imagination since the aerodynamic are undoubtedly significantly better with windows up. However, after googling the topic maybe not; at any rate some sources seem to suggest differences not necessarily all that great and at highway speeds and that it really depends on many factors.
Another Link.
http://www.sae.org/events/aars/presentations/2004-hill.pdf
posted by 75.100.8...
Summary few studies
Posts in this Thread:
- Is it possible to do 35mpg on a 9-5?, Wasabi, Tue, 27 May 2008 06:16:00
- Saw it once, ursaw, Wed, 28 May 2008 18:01:36
- Yes, at 62mph highway, john b, Tue, 27 May 2008 16:21:13
- Re: Tires & Octane, NDS, Tue, 27 May 2008 15:43:47
- Re: Is it possible to do 35mpg on a 9-5?, robp, Tue, 27 May 2008 13:25:44
- sure, why not?, LesH, Tue, 27 May 2008 11:51:49
- Re: Is it possible to do 35mpg on a 9-5?, Bill U, Tue, 27 May 2008 10:18:15
- Re: Is it possible to do 35mpg on a 9-5?, metrognome, Tue, 27 May 2008 08:08:09
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