How exactly do Bud/Miller/Coors brew such consistent beers??

[grndslm]

Crazy amounts of temperature control, blending batches, yeast batch verification with microscopes...things that no homebrewer could ever hope to accomplish with our limited resources.

This about sums it up.

But I have one more nugget to add....

Large breweries address these issues [of transportation] in a number of ways. Anheuser-Busch, for instance, stores and grows up all of its yeast at one location, in part for security purposes, and ships the liquid yeast out to satellite breweries around the world. Other large breweries propagate yeast at multiple facilities, making transportation less of an issue but creating the potential for varying yeast quality from place to place.