Regardless of dry or liquid yeast, you want to use enough yeast for the OG of your batch. At least use the calculator from Mrmalty, and if you happen to have more yeast than the calculator calls for, then that's okay. It's harder to over pitch than under pitch.
Drinking Fat Tire Clone
Carbing/Aging Westy 12(new world), Chocolate stout V2, Pumpkin Ale V2.5 (1st batch 2014)
In the bucket Pumpkin Ale V2.5 (2nd batch 2014), Kinda Double Bastard
On Deck The Kaiser, Blue Moon, oatmeal porter