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The key question in the first set of data is:
How reliable are the results? I didn't do multiple runs without changing variables to see how close the results would be.
So I went back...
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I did 4 runs tonight without changing anything on the car, and each was longer than the previous one.
Which tells me:
1) The drive train was still warming up (tires warming & pressure increasing, bearing temps going up, tranny oil warming up, etc.). I drove a "cold" car straight to the hill, roughly 6 km.
2) The runs I did previously would have suffered from the same effect, (I drove on a "cold" car straight to the hill) which means the effects noted would likely have been even larger if the runs had been done with stable drivetrain temps.
So that's crummy. There's no time saving in having a local test track, because I would have to drive around for half an hour just to get the car warmed up for valid, repeatable runs.
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