Jim,
I'd still prefer the theoretical method. With one simple measurement, two
minutes with the manual and perhaps a half-hour with a spreadsheet, you can
discover all you need to know, before hitting the road for a couple of spot
verifications.
Doing it "for real" entails a lot of variables - rock-steady throttle,
random differences in punching the watch at markers (a study once showed
that most of us were inconsistent, AND we often hit the mark before we reach
it) a police-free road, for any checking over 70MPH, extended running at
redline (in the lower gears) etc., etc.
Dick Hosmer
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