Myth: Fasted cardio is better than fed cardio for fat loss
Truth: "... despite a logical rationale for superior effects of fasted cardio for fat loss when compared to that performed in a fed state, acute oxidation data as well as longer-term trials have failed to support it. Instead it would appear that there is little to no difference between fasted vs. fed exercise for the goal of fat loss, a conclusion that is supported when looking at things from a theoretical standpoint. As such, if fat loss were the aim, my recommendations would simply be to perform the type of cardio that you prefer and can consistently do on a regular basis."
That's the short answer. Here is my full article on fasted cardio, from which this excerpt was taken: