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Old 05-30-2008, 07:31 AM   #9 (permalink)
adam728
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Join Date: May 2008
Location: Michigan
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Mazda3 - '08 Mazda 3 S
90 day: 29.65 mpg (US)

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Quote:
Originally Posted by adrive7 View Post
If you have the material, I would go with option "B". Try to make the transition from gas tank to panel to bumper as smooth as possible. Although, really at this point the flow is already ridiculously turbulent, so a bump won't matter too much.
I'm agreeing with this guy. I'd start up front to realize gains. I doubt the rear bumper is catching much air underneath, as flow is in no way laminar and shooting up in there. The axles will be destroying airflow long before it reaches that point.
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