For the earlier 4000 series, Loadmatch was essential to prevent stalling. When I had my 4310 tractor, I used Loadmatch A LOT, even during transport. Now with my new tractor I find I hardly ever use it. I believe Loadmatch was, and is, the best invention recently to improve productivity on tractors with moderate HP that are relatively heavy and are capable of handling heavier loads. I would think one could leave it on all the time without concern. I do not know what effect it would have on economy, but I am sure it would prolong transmission life because it would tend to reduce instantaneous load and thus heat. With my former machine, I am sure that it was faster at about everything with LoadMatch on; now I would say LoadMatch makes little speed or performance difference for me.
John M