A (somewhat old) chart I found interesting:
Code:
Car Frontal Cd Hp needed at Hp needed at Hp needed at
Area 100 mph 125 mph 150 mph
2000 Subaru Impreza 2.5 RS 22 0.35 54 105 182
1998 Ford Mustang GT 22.5 0.34 54 105 181
1996 Honda Civic DX Hatchback 20.5 0.32 46 90 155
2001 Volkswagen Golf GL 20.5 0.31 44 87 150
1997 Acura NSX 19.2 0.32 43 84 145
2000 Honda Insight 20.4 0.25 36 70 120