>>1869038high end singlespeed chains lasts the longest
pic related is a customer review on rosebikes of the narrow kmc e1 ept, officially rated to 3500+ km on a mid motor e-bike, the wide e101 ept is rated to 10000+ km
i haven't looked into how zero friction has done the tests, like if it takes chain angle into account or if they're entry level 8/9 speed chains. kmc x8 has been said to last very long for touring with hub gear bikes.