[lunarhighway]

well in theory if no other forces are at work lowering a car does decrease the frontal area slightly

if you lower a car by 2.5cm about 1 inch

and your tires are 15cm wide

than you'd reduce the frontal area by

2*15cm*2.5cm=75 square cm

if the standard car has a frontal area of 2square meter and a Cd of 0.30

than it's Cda would be 2*0.3= 0.6
ofter lowering the fontal area is

2-0.0075=1,9925
the new Cda would be 1.9925*0.3=0,59775

this would have the same effect as lowering the Cd from 0.3 to 0,298875

that's roughly a 0,001 decrease in Cd

of course this is just an example and once again perhaps being closer to the ground has other benefits wich outweight the reduction of frontal area.

on some cars frontal area might be even further decreased by suspention linkages being more retracted.