I've replaced the original set of MXM4s at 44k with an average of 257Wh/m in one year (don't ask) 90+% freeway driving at 75-85mph. Might have got to 50k but I've got a freaking screwdriver into my back left tire on I-10 that basically shred it so I changed all four. Pretty decent I'd say. Got another set of the same installed. Car is a 2020 LR AWD with 18" aero caps on