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Hi jimepting,
There may be another approach that is somewhat reasonable for comparing aero changes without doing it all in one day.
I still am collecting coast down data on a single road on the way to work each day. This is assuming no snow, and clear road conditions. Most of the time, this road has no traffic at all in either direction.
The idea is that collecting this data will hopefully show the effects of air temperature on the coast down numbers as summer approaches.
With information in hand, one may be able to perform constant speed road testing during calm conditions (which is hard to find in it's own right) and use the temperature guide as a way to correlate different runs on different days, with varying temperatures. The temperature greatly affects the molecular density of the air, and thus the overall drag component. Come to think of it, the temperature also affects the Crr component as well.
I still favor making multiple runs with one setup, on one day, maybe making drastic changes to the car on the weekend, then testing those changes on the way to work.
Maybe not as clean and consistent as doing all the changes in one day, but adding under body panels AND the tail extension to the car would take multiple hours to accomplish just one change.
Practicality speaks!!
Jim.
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