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Old 04-29-2013, 09:24 PM   #4 (permalink)
JRMichler
Master EcoModder
 
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Join Date: Feb 2011
Location: Phillips, WI
Posts: 980

Nameless - '06 GMC Canyon
90 day: 31.33 mpg (US)
Thanks: 187
Thanked 411 Times in 263 Posts
You have to test your specific vehicle. Use an Ultragauge or Scangauge to watch the coolant temperature.

My truck, for instance, had the upper grille, the lower holes, and the slot between the grille and bumper fully blocked. The only opening was the slot behind the license plate. The AC worked fine at 100 deg F on a level road, and at 93 F on a sustained upgrade.
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The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
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