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Old 02-13-2008, 08:20 AM   #21 (permalink)
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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: 53.56 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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igo: that's a tough call. The width of it suggests to me it's making things worse, not better.... BUT the height and depth look reasonable.

The best way to tell for sure would be to tuft test the trunk with it removed, to see if there's any flow attached at the back of the deck lid.

Like this... Video: tuft testing (rear) 1993 Ford Mustang notchback

What angle do you get if you follow Phil's advice and draw a line from the trailing edge of the roof to the trailing edge of the trunk (a) without, and (b) with the spoiler?

Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
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