Did you look at the link? 4% by volume is 3.2% by weight which is I think what people generally talk about informally.

But yeah, I hate Coors too.

Snopes covers this today with larger images and one additional twist on the tale:

"THESE PICTURES DON'T EVEN COME CLOSE TO WHAT IT REALLY LOOKED LIKE. CENTURY 21 HAD ALREADY MOVED SOME OF THE CANS OUT AND HAD CAVED IN TUNNELS THAT HE HAD MADE TO GET TO THE BEDROOM, BATHROOM, AND KITCHEN."