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18% isn't just a lot. It would be revolutionary.
It would take all of the lesser extreme aero mods in the ecomodder arsenal to get near 20%.
Here are some more realistic aero mod numbers:
2%-3% side mirror delete.
2%-3% grill block
2%-3% rear wheel skirts
2%-4% smooth wheel covers
3%-4% belly pan
4% kammback
3%-5% front air dam
7%-8% pickup fast back or aero shell bed cover
10% full boat tail
14% deleting a big ugly OEM roof rack.
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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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