My only concern is that (it appears) you only did one run. From first to last you have the variable of engine temperature, which traditionally gets hotter more efficient as it goes up. One run also does not account for a wind change, temporary draft, so on.
So, to account for this, immediately after very fast, ultra slow would have to be redone, if one wanted to better delete the variable.
Don't get me wrong, I only do one test run (after I warm the engine) of all my speeds for my own personal record keeping (it's too expensive to test well!), I just wanted to bring up this point.
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