For me, even for endurance stuff, I find the trainer a better way to hit the higher end, for whatever reason I have trouble getting a steady 70-75% outdoors, I seem to always default between 60-70%. I rode a solo (almost) century yesterday, my IF was 0.67, it gets easier to put power down on some sustained hills but otherwise it requires a ton of concentration from me to get to the upper z2 range that is just so much easier with erg mode. Not that I’m riding 5hrs indoors to know for sure, but maybe someday I’ll try 5hrs at 0.7 lol
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