The wheels are tilted inwards to help with handling (negative camber), so the inside edges wear faster. The dealer is not bull-sh****g you, so you should buy this, he is looking after you. Turn the wheels to full lock and check this out for yourself.
Also rear tires wear faster than fronts as they put the power down for the car (in RWD). Even with X-drive, the rear tires carry more load due to weight transfer during acceleration. It is not unusual for rear tires to wear significantly faster than fronts.
"To suffer the penalty of too much haste, which is too little speed." - Plato
Last edited by ///M-ratedE90; 11-16-2012 at 10:25 AM.