I have this problem too... but an inch of difference?!? That's a lot! When the car was new, this was not the case.

I had this tilt problem with the stock suspension, and then replaced it with H&R/KYB combo. I still have this problem, but not as bad. My only explanation for this is that when new, the softest suspension components (the bushings) are new and stiff. But over the years, the imbalance weight of the engine/driver/steering/etc wears out the driver's side bushings more, and so it sags to that side. I hate this.