Darin,that's not me.
I'm deferring to Hucho with respect to a constant Cd,and velocity at which it would occur.Any fluctuation would seem statistically insignificant if back-to-back testing were conducted with the same vehicle at equal velocity.
Sure,we'd want to track any meteorological differences which could affect results,but for lay people,lacking thousands of dollars per hour in a world-class full-scale tunnel,we might allow the luxury of presuming a constant Cd for the subject vehicle.
I'd go nuts otherwise!
PS,thanks for sharing the link,it's a good discussion.
