The GPS may not be entirely to blame. The quickest route from either Detroit or Flint to upstate New York or Vermont is Highway 401 acrosss Ontario with a branch to the Queen Elizabeth Way for Buffalo or to the Thousand Islands bridge for Syracuse or Vermont.
In general, I've found that a few minutes spent studying a highway map prior to a trip to an unfamiliar location pays off many times in gas and time saved getting there.
I've read that the Michigan,Ohio and Pennsylvania legislatures are trying to force GPS makers to change that because it denies the armed tax collectors of their state police forces the opportunity to get some "quality" stops. ;-)
Too true. Set the GPS to find the “shortest route” and you will be led into the vast back road empire of highways in hiding. I once was vectored through several very small neighborhoods...but it was the shortest way