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Old 03-12-2011, 12:16 PM   #4 (permalink)
Tango Charlie
Deadly Efficient
 
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Join Date: Jun 2008
Location: Goshen, Indiana
Posts: 1,234

Olivia - '03 Pontiac Vibe base
90 day: 36.01 mpg (US)

R2-D2 - '00 Honda Insight
90 day: 58.81 mpg (US)
Thanks: 134
Thanked 176 Times in 91 Posts
Spydyr
I've had pretty good luck with blocking the upper opening and restricting the lower. I have also added coroplast ducting between the opening and the radiator. I would guess you could block off three fourths of that lower opening. Do you have a ScanGauge to watch coolant temps? Don't trust the cars stock gauge; they're notoriously inaccurate.
You can see what I've done in my Vibe thread- see link below.
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