Second, my temp. gauge stays below the mid point now
>almost all the time.  I think,however, that this is due to the improper
>ratio of coolant to water.
>I believe that too much coolant can
>cause this problem, but perhaps someone can correct me if I'm wrong.

Actually, I believe that straight water is a better thermal conductor than
coolant.  I believe that's why you never use straight coolant; although it
would give you great boil over and anti-freeze protection it wouldn't keep
your motor cool enough.  Seems like too much coolant, not enough water would
make the motor run hotter, not cooler.  I could be wrong however, so don't
listen to me.
Mark