Agreed, I mostly referred to gear changes (downshifts) used to engine brake as I described in my other comment: it's certainly less friction than on brake pads,

Agreed, I mostly referred to gear changes (downshifts) used to engine brake as I described in my other comment: it's certainly less friction than on brake pads, but it's slightly more than with usual gear changes (assuming smoother rpm matching). But we are talking minute wear on either, but the price difference is significant, so I just wonder — translated to thousands of km/mi — how does it compare?