I have had this problem & found the solution - it is caused by incorectly set toe in - some tyre fitters are using plain falcon settings on XRs - the less toe in (or worse, some toe out), the more the inner edge of the tread & shoulder will wear. I had a set of front tyres that only lasted 16,000km - I expect 40,000km - when the replacements were fitted, I asked them to measure the wheel alignment before they started & they found the toe in/out was 0.03 degrees toe out. Less toe in makes the steering more sensitive or twitchy on freeways & increases the dry weather front end grip / oversteer = you can hit lower speed bends like you are on rails - the rear lets go first. It also increases the rearward load on lower front suspension bushes. More toe in provides the opposite. In wet weatther, all bets are off - you may oversteer or understeer, depending on road surface, tyre pressures & wear, driver's right foot. As per the manua,l for the BA series sedans: A plain falcon has between 0.02 degrees toe out & 0.18 degrees toe in, with 0.08 degrees toe in optimum. An XR Falcon has between 0.06 degrees toe in & 0.26 degrees toe in, with 0.16 degrees toe in optimum. Toe out is fun, although expensive - I have never gone through Galston Gorge (northern Sydney) as fast or as easily as with the toe out setting. JohnT.