Originally Posted by
Plastkin
IIRC you get slightly more raw damage out of FS on 3 targets but I left room for fudging since you have the possibility of getting Heating Up out of using Pyro on 3 targets which would result in more DPS assuming the targets are living for long enough to refresh Ignite a few times and have the full benefit happen before you run out of instants.
On 4 FS significantly outweighs Pyro/Ignite damage. Here's some quick math not factoring in everything:
Pyro, assuming 20% mastery and 60% crit, 3% extra crit damage:
Base: D = 1.6996*400, I = D*0.2
1 target = D + I = 815.81
2 targets = D + I + (8/9)*I = 936.67
3 targets = D + I + (8/9)*I + (7/9)*I = 1042.42
4 targets = D + I + (8/9)*I + 2*(7/9)*I = 1148.17
5 targets = D + I + (8/9)*I + 2*(7/9)*I + (6/9)*I = 1238.82
10 targets = D + I + (8/9)*I + 2*(7/9)*I + 4*(6/9)*I + 2*(5/9)*I = 1661.83
FS, assuming 20% mastery and 60% crit, 3% extra crit damage:
Base: D = 1.636*180, I = D*0.2
1 target = D + I = 353.38
2 targets = 2*(D + I) = 706.75
3 targets = 3*(D + I) = 1060.13
4 targets = 4*(D + I) = 1413.50
5 targets = 5*(D + I) = 1766.88
10 targets = 10*(D + I) = 3533.76