Peakster's First Formal Experiment a Success! - Fuelly Forums

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Old 01-13-2007, 12:30 AM   #1
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Wink Peakster's First Formal Experiment a Success! 2.213% mpg increase.

With my dad coming back from Las Vegas on Monday, he's no doubt going to be asking why I removed the side mirrors from my Geo. Tonight I did an experiment to see the difference in FE with mirrors on Vs. mirrors off:

Date: January 13, 2007
Time: 12:30am - 2:00am
Temperature: -9.4*F to -7.6*F
Winds: SW @ 9.3 mph
Location: Regina's Ring Road Expressway... very flat road
Speed: 70mph with cruise control
Length of each test: 7 miles
Method of testing: A-B-A-B
Tools used: Scangauge II and Hi8 Videocamera

Route:
Attachment 155

Results:
36.2 mpg (mirrors on)
36.9 mpg (mirrors off)
36.1 mpg (mirrors on)
37.0 mpg (mirrors off)

Average mirrors on: 36.15 mpg
Average with mirrors off: 36.95 mpg

Therefore 2.213% FE increase without mirrors during the above conditions.

All figures were average readings from the Scangauge II during each 7 mile test.
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Old 01-13-2007, 07:32 AM   #2
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Very nice! One thing I noticed is the temp is "Temperature: -9.4*C to -7.6*F" which format is it supposed to be? Celsius or Fahrenheit?

Other than that, it's great to see more info supporting the removal of the side mirrors for increasing FE.

Makes me wonder more in my smaller more aerodynamic mirrors would be even better off the car completely.
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Old 01-13-2007, 09:13 AM   #3
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Nice test, Peakster
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Old 01-13-2007, 10:48 AM   #4
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Originally Posted by Peakster View Post
Therefore 2.213% FE increase without mirrors during the above conditions.

All figures were average readings from the Scangauge II during each 7 mile test.
Good job, Peakster. Very thorough and scientific. I noticed the clock when you finished these tests. 12:30AM till 2:00AM. That is dedication. To give us an idea of what's involved in a good test, please estimate the total time you put into this project. P.S. time and flashlight batteries.
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Old 01-13-2007, 12:07 PM   #5
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Very nice! One thing I noticed is the temp is "Temperature: -9.4*C to -7.6*F" which format is it supposed to be? Celsius or Fahrenheit?
Thanks for pointing that out. The temperatures are now both in Fahrenheit. The temperature cooled off slightly near the end of the experiment but the winds were stable.

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Originally Posted by CO ZX2 View Post
Good job, Peakster. Very thorough and scientific. I noticed the clock when you finished these tests. 12:30AM till 2:00AM. That is dedication. To give us an idea of what's involved in a good test, please estimate the total time you put into this project. P.S. time and flashlight batteries.
12:30 - 2:00am was in fact the total time out in the Geo. Each 7 mile run took no more than 6 minutes at that speed so it was only really 48 minutes of driving for both the test and driving the car back to the starting point.

Actually that's a lie, the first run screwed up because when I started to accelerate, two vehicles merged on the highway and refused to leave the passing lane open, causing me to hit my brakes . Luckily I was only about 3 minutes into the run so it wasn't much loss of time.

The mirrors attachement and removal time were really quick. Maybe 3 minutes to take them off/on (I only attached them with one screw to the door). I left the Geo's engine run the whole duration, so the Scanguage didn't shut off at any time during the 12:30am -2:00am period to provide a more accurate reading between runs and so I can just hit the 'resume' feature on the cruise control for the next run.

However, if you really want to know how much extra time I spent preparing for the test itself, I was trying to look for an audiocassette recorder (for documenting mpg numbers) for a half-hour before settling for my camcorder!
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Old 01-13-2007, 03:26 PM   #6
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very well done
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Old 01-13-2007, 03:38 PM   #7
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Thanks for getting out there and doing it.

Note for those whom are removing their mirrors right now:
The mirrors probably have a much greater effect on FE at -7 deg F than under the average conditions many of us will be driving in.
Perfect conditions for illustrating the difference though.
Phil Knox found no difference in top speed with or without the mirrors installed on his CRX at 100MPH on the salt flats, so he determined that the effect on FE is pretty small compared to other aero mods.
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Old 01-13-2007, 06:13 PM   #8
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The mirrors probably have a much greater effect on FE at -7 deg F than under the average conditions many of us will be driving in.
MetroMPG did a similar experiment at higher temperature with lower speed. With the passanger side mirror removed and driver's side folded back, his car netted a 2.3% increase in FE. Not a far cry from my results.
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Old 01-28-2007, 02:36 AM   #9
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Exclamation Update!

I just put the video of my experiment on YouTube. Enjoy!
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Old 01-28-2007, 08:41 AM   #10
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You're such a cutie,

Nice test though, very well executed.
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