[aerohead]

* The Lightyear has a fineness-ratio of approx. 3.3243, and Cd 0.20/ 0.175, and conforms to the AST-II, and diffuser angle of 15.5-degrees.
* Lightyear's 'next door neighbor', the GM Aero 2002/ GM Aero 2003A, has a fineness-ratio of 3.3320, and Cd 0.14/ 0.13-something, and conforms to the AST-III, with a diffuser angle of 11-degrees.
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* The Lightyear-One has vestigial rearview side mirrors/cameras.
* The Lightyear- Zero abandons the side mirror location, and moves camera pods into the wake of the front wheel arches.
No idea what the tires size is.
No idea if the 'taped' car Cd reflects the 0.175.
No idea if Cd 0.175 is a 'crosswind-averaged' value.
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* The GM Aeros are 'mirror-less'
* Their tires may be as narrow as 145mm, which, according to Pontiac Trans Am testing, compared to the 195mm section of the Citation-IV, would provide a Cd 0.025 drag reduction.
* GM's development testing of the GM EV1/ 1999 Precept concept indicated side mirror drag of Cd 0.015.
* 'Features drag' of the Precept was Cd0.0000 ( all cut lines and gaps taped over made zero difference).