playing more than 1 table +EV?

[RustyCJ]

This has probably been talked about at some point and I generally play 1 table at a time, but when I'm going to leave the table I've been playing for a looser table I will sometimes have a hand in both simultaneously until the blinds reach me on the table I'm leaving.

I've noticed that when I have 2 tables up I pay more attention - basically surfing less and watching TV less and I pay more attention to the action at the tables.

Has anyone else found this to be true or am I simply deluding myself?

I would also wonder then, as I'm certain this probably does hold true for at least some percentage of people, at what # of tables could someone expect to see the greatest BB/100?