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Old 02-21-2012, 09:02 AM   #6 (permalink)
tru
EcoModding Apprentice
 
Join Date: Aug 2011
Location: FL
Posts: 126

tru - '05 Ford Focus ZX3
90 day: 39.46 mpg (US)

the truck - '02 GMC Sierra Denali
Thanks: 0
Thanked 7 Times in 6 Posts
my experience this past week with a lawn edge air dam was a reduction in mpg's at speed. I think my car is fairly clean under neath and the dam increased frontal area and didnt reduce CD enough to justify it. I modded the Dam this weekend to only block the front tires and will see how that works out when i get my scan gauge back...
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