My front tire seems to be wearing down on the left side faster than the right side. Now, I've looked at a couple other bikes that are local to my area and they show the same wear, but it just seems odd that the left side would be that more worn than the right.

Most of the roads here are on a slight grade, as I'm sure they are anywhere, to allow rain runoff, so I'm constantly having to put a slight left lean into the bike to keep it straight on the road.

Does this sound normal or is there something wrong with my rim/frame/etc?