So far, so good. Two different tunnel systems, two MoleMuffler treatments, no repeat offenders. I wish I could actually SEE them gasping and choking, and then puking and falling over, but I guess as long as they die and quit digging, it's good enough for me.
Did learn one more thing about moles. The last tunnel system I hit, was only about 12 feet long, and no visible means of entry or exit. So I am standing there with the engine running, studying the tunnel, thinking "How the heck does the mole get in there? Where did he go?" So I took a wooden dowel and stuck DOWNWARD at the one end of the tunnel, the end that faced the woods. Sure enough, the tunnel goes downward, at about a 45 degree angle, into the ground really deep, like maybe 8-10 or more inches. Where it goes from there, I can't tell of course. But that explains a few things. I was left wondering how far the exhaust will travel down in there, killing multiple moles, entire families and colonies of moles. Ok, maybe a bit optimistic.