Windows on the highway and grill block - Fuelly Forums
Go Back   Fuelly Forums > Fuel Talk > Aerodynamics
Search Today's Posts Mark Forums Read
Thread Tools Display Modes
Old 07-30-2007, 05:36 AM   #1
Registered Member
Join Date: Sep 2005
Posts: 262
Country: United States
Windows on the highway and grill block

I was wondering what would be the best thing to do for aerodinamics with my civic 2 door hatchback. I don't know if the fact that I only have two windows change something, but I would like to know if I can let my two windows open about a inch when I'm driving on the highway, or it is really recommended to closed them both. What are they impact?

And in winter, I usually let my windows open about a inch, half an inch, will that do a litle effect on my MPG or sould I just closed it?

About the grill, what material should I use to block it, and I saw people letting some places opens. I'm driving in winter and in snow to. Could people that have there grill give me some clue plz.

GasSavers_BIBI is offline   Reply With Quote
Old 07-30-2007, 08:04 AM   #2
Registered Member
brucepick's Avatar
Join Date: Feb 2007
Posts: 722
Country: United States
Location: Connecticut
Summer highway windows
All glass shut should give the best FE. However sanity has to prevail; we all have our limits as to how uncomfortable we're willing to be. Usually vents open plus some combination of windows cracked will make your ride reasonably comfortable. That will have lower FE than all windows shut but will be better than all open or AC on with windows shut.

Winter windows
OK, this being July that will be the topic of least interest by now. But here goes...

With windows open in winter there is more air going through the heat exchanger which will draw more heat off the engine. You'll be constantly drawing heat off the engine which it has to replace. I keep my windows shut, and have plans to block off the passenger side duct next winter for the many times when there is no passenger in my car.

Presumably all cars today have some flow-through ventilation so you won't asphyxiate while driving.
Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.

Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.
brucepick is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
How can I remove EPA type for my vehicle? airbus Fuelly Web Support and Community News 2 08-26-2011 02:00 AM
I just lost some weight (166lbs) kickflipjr General Fuel Topics 21 04-11-2007 11:27 PM
$3 ef headlight warning buzzer budomove General Maintenance and Repair 3 02-05-2007 04:51 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 01:29 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.