Originally Posted by
T8191
1. Car or Hotel [or both] but not Mix & Match!
2. Impenetrable question, depending on where/when. I've never noticed substantial saving over booking Flight and Hotel separately.
3. BAH can be very flexible - if you have a problem, call them.
Just as a data point I recently saved $500 by booking the Fairmont in Austin as a BAH as opposed to separate.