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I believe it, because its a huge aero mod that covers a lot of square footage and only gets you a minimal 3% or 4% fuel economy improvement.
While lowering the front bumper or putting in an air dam seems to have the same effect and does it with a tiny fraction of the work and materials.
Given that we have a pretty small sample size to compare the trend would lead me to test an air dam first.
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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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