In my somewhat limited experience and only applying to cars that I have
worked on, if your car runs 226 in the last mile and 231.5 exit speed, you
need to do something about your acceleration in the first 4 miles and a
transmission is a good thing to look at. If on the other hand your car runs
208.4 in the last mile and 208.7 exit speed your 2 speed is doing OK and you
need different rear end gears or more horsepower. My 2 cents worth
that cost lots more to learn. Rich Fox PS its not the MPH but the spread.
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