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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.
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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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