novicef go here and all your questions will be answered. Scroll down and on the right hand side you'll see 'Engine Related Columns'. You're looking for one called 'Manifold Pressure Sucks'. Read also the one on Props and especially 'Mixture Magic'.
http://www.avweb.com/news/columns/182146-1.html
I used to correspond a lot with Deacon and I operate my Bonanza this way.
LOTS of other entertaining reading there too...he's an interesting fella.
Chuck.