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Old 08-30-2012, 03:28 PM   #4 (permalink)
Got MPG?
Join Date: Sep 2010
Location: Southern Alberta, Canada
Posts: 330

The Car - '09 Toyota Corolla CE Enhanced
Thanks: 13
Thanked 43 Times in 38 Posts
I have tried both in front of and on the back of the grill, there was no measurable difference between the two on the 2009 Corolla. It may be dependant the properties of the grill so your results may be different. However on the 2012 Ford Focus, Fiesta and other cars, they have active grill shutters and fake grill openings etc that all use the "in the back of the grill" construction. If it made a large enough of a difference they wouldn't have bothered to make it look the way they did.

I have mine behind the grill.
2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.

Last edited by LeanBurn; 08-30-2012 at 03:45 PM..
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