Bud = GM/Chevy
Miller = Ram(http://www.autoadmit.com/thread.php?thread_id=3901842&forum_id=2#35471149)
Chevy and miller are both a bit offbeat, but still pretty mainstream
I think ram and coors are similar(http://www.autoadmit.com/thread.php?thread_id=3901842&forum_id=2#35471286)