My trainer distance is always much shorter than what that effort would be outside. I attributed some of that to how mind numbing it can be looking at the same wall. In my case, the resistance is generally higher - as if I was always going up hil.
Interesting. Resistance is lower in my case. We have so many real hills that I don’t turn up the treadmill incline very often; it doesn’t feel like a real hill to me. If the distance *is* accurate, it’s probably because the treadmill forces me to maintain a particular pace (or paces, if I’m doing intervals), which is mostly good but prevents natural variation in speed. If I have full control over my pace, I suppose I can be braver about short bursts of a faster pace, knowing I can slow down when I choose.