I can't recommend plugging for fear of litigation it but I've ridden probably 4,000 miles on plugged tires & have reached speeds with the plugs that certainly wouldn't be recommended by anyone. What's the worst that could happen? The plug falls out & your tire slowly deflates. (Provided it was a very small hole in the first place & you didn't open it up too far installing the mushroom plug.) You feel the tire start to feel a little low & you pull over, put another plug in & ride home to install a new tire. I figure my chances of having my tire go kaboom & maim me from a plug falling out are probably much less than that of deer, tractors, gravel, or Amish wagons, etc, etc, etc getting the best of me. I'll probably get flamed from the do-gooders for this, but this is just my experience with the subject.