Fueling during workouts on carbs like a sports drink will allow you to recover faster for the next workout. Doing fasted workouts will trigger an adaptation to burn fat more effectively making you more metabolically efficient. This probably will delay recovery if you are not already well fat adapted. So figure out which goal you are trying to achieve. High intensity workouts need to be dine when you are well fueled on carbs and a full glycogen gas tank or they will be compromised. Low intensity long duration aerobic workouts under Aerobic Threshold are the ones to do in a fasted state if fat adaptation is your goal.
I hope this helps.