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Quote:

There seems to be a common misconception within the warlock community that Fel Flame should be used to refresh Immolate. As a basic rule of thumb there are only 2 reason to ever cast Fel Flame, these are:

During unavoidable movement, and only when Conflag is on CD, Corruption does not require refreshing, the boss is out of range of Shadowflame (or it's on CD), and you do not require mana from Life Tap.
When the T11 4pc bonus procs.

Outside of these 2 reasons, there really isn't any other situation Fel Flame should be used. Using Fel Flame to refresh the duration of Immolate will result in a DPS loss, this is due to the number of GCDs required to increase the DoTs duration to it's original duration. If we compare this to the time required to simply re-apply the DoT over a 5 minute (300 second) fight:

Assuming a 1 second GCD, over a 300 second fight we will cast Immolate 20 times, requiring 20 GCDs. It will require 3 Fel Flames every 15 seconds to achieve the same result. This is a total of 60 GCDs used over the course of the fight, wasting 40 seconds of time during the fight to keep a 100% uptime on Immolate. This is almost 27 Incinerates worth of time spent refreshing Immolate using our lowest DPET spell, obviously not optimal.