Sorry, I thought the p-mail about mythbusters was cc'd to the list (I only
get digest).

Apparently episode 38, Season 3, concluded that above 50 mph you get better
mpg with AC on and windows up (drag factor), but below 50 it is best to have
AC off and windows down.  I will be testing this on the bus in future.  I am
altering my record book to take into account my highway speed and whether or
not I had AC on and windows up or down.

Maggie