Are you sure this is accurate? Studies have shown when athletes were tested to run on a track vs a treadmill, they had *slower* run times on the treadmill when told to exert what *felt* like the same amount of effort as running on the track. That would lean towards the treadmill *feeling* harder to run on and causing a slower pace than they ran on a track.
That said, a treadmill at a 1% grade is all that’s needed to simulate the difference in effort required between track running and treadmill running. Any “assistance” from the belt moving under you is effectively cancelled out by the grade leaving the only factor unaccounted for the wind resistance from you moving forward vs staying “in place” due to the treadmill.
([source](https://runnersconnect.net/treadmill-running-easier/))
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