Lower the rear
Was looking at my jeep, the back is way high too high because the frot springs sagged. looked at several other vehicles, looks tha same way. Manufacturers raised the back to allow for cargo carrying capacity, and I think a lot of front springs sag on older vehicles, looks like if the back of most vehicles was lowered a half to one inch they would be more aerodynamic, the slanted roof creates too much downforce because it acts like a spoiler
now if you were to lower the back 2 inches, the grill would be more aerodynamc, the windshield would be on more of an angle, the roof at the windshield would be the highest point that would allow the wind to start falling off immediately
a lowered front air dam would cancel any negative effects of lowering he back
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