Road miles fill a unique niche when it comes to races. Running is a sport dominated in recent years by half and full marathons, trail running, relays, and adventure races like the Warrior Dash, with the occasional 10k and 5k mixed in. Races shorter than 5ks are usually restricted to the track, making road races for “middle distance” runners a special treat. That’s why I was so excited when the Growl to Garden Road Mile…