Yours does seem like an extreme example, but I've seen noticeably more tyre wear on the inner edges of the front tyres on the majority of 166s I've looked at. The first 166 I had looked completely legal from the outside but the fronts were worn to the canvas at the extreme inner edge.
I put it down to:
1) the negative camber, that gives us the sharp turn in we love;
2) the fact that the 166 is a heavy car for a front wheel driver; and
3) how hard you drive... while the negative camber helps on turn in, I'm guessing that under heavy straight line acceleration you're putting more load through the inner edges of the tyres.
Found a good article on suspension design here:
Caster, Camber, Toe