When to do cardio... AM, MID DAY, PWO

[Deltasaurus]

do both and have your shake after your done with your Post WO cardio

[POPS]

I do my cardio right after my workouts. Mon/Tues/Thur/Fri. 45 min steady state keeping my h.r. around 120-130bpm for the entire time immediately followed by pwo shake. Many members here have told me that this is the best way to burn fat without burning muscle for fuel. Any thoughts??