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You can infer CdA from your coast-down tests, and measure A visually. (Check for other threads on those two topics on this BBS.)
Constant-state runs, both directions on the same stretch of flat road, back to back, repeated many times, in as close to windless conditions as you can manage. Average everything, look for outlying results and see if there are reasons for them. If you can keep your foot absolutely still on the gas (verify with scan-gauge), do so. If not, then use cruise control to maintain speed.
Perhaps measured accelerations, either using SG to hold a set load, or using the "accelerate" function of cruise control? I'm not sure exactly what results you'd get from that.
Sounds like you've covered the biggest ones.
Oh, try to quantify the tires' rolling resistance. I recall a thread where someone used a scale to push their car, and crunched the time/speed/force numbers to get an approximation of drag from non-aero sources. At very very low speeds, assuming aero drag is zero is a pretty decent approximation.
-soD
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