Great study. Sorting this table by CdA, the ten most aerodynamic production cars (not counting EV1) are:

Saab Sonett III (Model 97) 1970 - 1974 0.31 46.8 59.1 15.15 4.7
Honda Insight 2000 - 2006 0.25 53.3 66.7 20 5
Honda CRX HF 1988 - 1991 0.29 50.1 65.9 18.6 5.39
Opel Calibra 2.0i 1989 - 1997 0.26 52 66.5 20.8 5.4
Scion FR-S 2012 - 0.27 50.6 69.9 20.6 5.57
Honda CRX 1988 - 1991 0.3 50.1 65.9 18.6 5.57
Toyota MR2 1991 - 1995 0.31 48.6 66.9 18.3 5.67
Toyota MR-Spyder 1999 - 2007 0.31 48.8 66.7 18.3 5.68
Nissan 200SX SE 1991 - 1994 0.3 50.8 66.5 19 5.7
Toyota MR2 1985 - 1989 0.32 49.2 65.5 18.1 5.8
Toyota Prius 2004 - 2009 0.26 58.7 67.9 22.4 5.83