To go off of this, "practical" again is used in a such a way as highly personal. As the definition is "Likely to succeed or be effective in real circumstances; feasible," if you feel it is more effective to ride further center, than that would be riding practical to the right. This statute doesn't FORCE you to ride close to the curb. In my own experiences, riding closer to the middle of the lane maintains a more evasive, and spacial ride, increases passing distance, and increases visibility. I feel much more threatened when I am closer to the curb and give the illusion to drivers that they can stay in their lane while passing me with VERY little clearance. By riding closer to the center you are taking away this option.