Yeah, I see that a little bit. I thought that it could be tire pressure...but I've been too lazy to check it. It also could be because every time I have a nice flat section of road to test this out on, I'm in the fast lane and the left lane of the highway slants just a bit, doesn't it? I mean so water drains off the road. Not much, but just enough to maybe make a paranoid car owner think something is wrong?
Anyway, here is an even better one. Look at your steering wheel. Mine is not straight. The tilt of a tilt wheel tilts the steering wheel up and down. Well imagine if a steering wheel tilted left to right...well my steering wheel looks slanted that way. Stand outside over the windsheild, look down, and you'll see it. I even measured from the dash to the top of the left side of the steering wheel and from the dash to the top side of the right side of the steering wheel and there was about 1 1/4" difference. Sooooo is the car pulling to the left or am I steering it that way when I put the wheel "straight". I know, this doesn't excuse the case where I have my hands off the wheel. It's something to think about though.