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Old 06-02-2009, 01:20 PM   #31 (permalink)
stevey_frac
EcoModding Apprentice
 
Join Date: Jun 2008
Location: Cambridge, ON
Posts: 240

Jalilah - '07 Chevrolet Cobalt LT
90 day: 40.57 mpg (US)
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First trip report with the grill block in place.

Temps were slightly higher then normal, but the thermostat is still not open all the way, so i believe i'm fine. The fan didn't come on once, including the brief periods of times when the A/C was on. So I fairly confident i haven't gone too far.

It's hard to gauge improvement without controlled tests, but i'd estimate about a 2% improvement in aero, going by feel and how i know my car.

-Steve

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