Try a run that is much longer (eg, 3 hours), then see how your 1.5 hour run feels. Usually you need a larger-than-normal stimulus to elicit adaptation. In my ex

Try a run that is much longer (eg, 3 hours), then see how your 1.5 hour run feels. Usually you need a larger-than-normal stimulus to elicit adaptation. In my experience, the mind adapts to these things and will essentially learn to shut off.