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Old 12-13-2013, 11:59 AM   #2 (permalink)
oil pan 4
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Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 11,189

Sub - '84 Chevy Diesel Suburban C10
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
90 day: 141.63 mpg (US)
Thanks: 270
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The OEM air dams improve fuel economy by around 5% or 6%.
But they have to be built for inept drivers to not tear them off on curbs.

Our over sized air dams increase fuel economy as much as 5% over the OEM joke of an air dam and around 10% over nothing at all on cars.

I added a 2/3 air dam - tire spat rig to my truck and it has increased fuel economy at least 1 full MPG. I call it a 2/3 air dam because the center of the air dam does not encompass my low bumper mounted intercooler. So the center of the air dam is just not there.
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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