I would agree with Jai about centre difflock usage , I have used it on and off on hard surfaces, where snow is layed in rows which you need to cross to change lane, as the vehicle is much more stable, likewise at speed on bush dirt roads esp in wet . The understeer "problem" is increased if acceleration is used , a trailing throttle generally pretty well negates this problem when cornering . Obviously using common sense is required long distance difflocked on a good tractive surface serves no purpose other than increased fuel usage , and tyre and component wear .JMHE