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I think all this tells me is it's impossible to compare things on different days and temperatures. A-B-A is best, but at a minimum, it needs to be an A-B done immediately before/after.
I'll try to do temperature compensation calcs later, and see what that says, but the other thing I need to consider is that (a) I possibly made things worse by adding the tray, or (b) it didn't help any!
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This seems to comfirm my suspicion that I had regarding coast down testing as being highly sensitive to subtle variations.
I'd also like to ask how that you go about finding the current atmospheric pressure since it fluctates from area to area. ( For instance, I could check the local weather on the 'net and see what the current pressure reading is, but that would be at the weather station. To have an exact reading you would need to actually have a barometer with you at the time of the test .... right ?
So is a hill really needed to do a coast down test, or can you do one on a flat road ?