Coggan Power Training - 7 Zones

Have you had your VO2 Max test done for the bike?
I’m putting out about 200 watts with 141 HR which is my Zone 2 peak. Should this be my average or my cap for IM?
I’ll be at IMAZ in November and I don’t want to blow up my legs and screw up my run. BUT, I feel that I could easily add 3-4 beats to my HR.