Hi,
You're getting the Cd numbers confused. A Cd of 1.9 is
terrible, and a Cd of 0.19 is outstanding. Take a look at
Wikipedia.
The Aptera Typ-1 has a Cd of 0.11 -- the best by far of any "real" vehicle I know of.
The Mercedes Boxfish (aka Bionic) has a Cd 0.19
The Honda Insight has a Cd of 0.25
The Toyota Prius has a Cd of 0.26
My Scion xA has a Cd of 0.31
A Jeep and Hummer have Cd's ~0.5+
A Formula 1 car has a Cd of 1.6 -- it generates 3.5G's of downforce, and it has ~1,000HP to overcome the drag.