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Old 05-12-2008, 09:42 PM   #6 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,125

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: 64.03 mpg (US)
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I would not block the entire grille. While your max temp may have remained constant, the cooling fan may also be coming on more to keep the temp stable.

The fan is a relatively high amp accessory, and the added load could negate (possibly worsen) your fuel economy compared to the aero gains of the grille block.

That said, welcome to the site.
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