forget mileage all together.
i mean write down what you do, for cause and effect, for fun and observation.
you do the work for adaptation to the event.
so adaptation requires the minimum effort to get that adaptation effect.
this is not a lazy thing. the minimum could be pretty hard.
in fact, quality work needs to make the lizard brain think you're life threatened, and you need to damage the system,
but only to the point where adaptation can take place.
and you repair in recovery. eat sleep, relax, massage, deep breathing, cross fit.
so you hit it hard and then wait until you recover to go again.
you just don't go this is speed day and just go like a moron.