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Old 04-22-2008, 09:18 PM   #3 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.78 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
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If the flow is currently attached at the trailing edge of the deck lid without the spoiler, then adding one will reduce MPG by a small amount (because you'll be increasing the size of the trailing wake).

I suspect flow IS attached there on your Corolla.

The way to tell for sure is to tuft test: http://forum.ecomodder.com/showthread.php?t=661
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