re: Can someone explain PGA tour average driver distance in this chart

The fact that you think it’s some special outlier is pretty telling of your ignorance of golf in general and how the pros play it. Look at every iron… 10-12 yard gaps. That is very intentional. The 4i is right where it should be based on the data given. You also probably haven’t noticed the angles of decent and peak heights. Also very intentional by these guys. Most controllable while still being able to get the distance when they need it.