From what i hear, not much fat is burned during cardio. Instead it is burned throughout the rest of the day by your metabolism, and it would be advantageous to do cardio that will stimulate your metabolism (high intensity interval training) and early in the day that way your metabolism work throughout the day. Basically you sprint for 15 seconds and slow it down to a light jog or walk for 45 seconds and repeat for about 15 minutes.

Obvious you probably do not want to listen to me because I am trying to gain weight. 135 to 155 in 1.5 months, 5 lbs probably from creatine and the rest from newbie gains. Mind you i am 6 ft tall so i was SKINNY.