1) I wonder if I'm the first 6th gen Mirage owner who has rust holes!
This is a design flaw: any water that finds its way between the inner & outer rear fender sheet metal is trapped in a "pool" at the rear portion of the wheel arch.
Since this is a problem that will affect almost all Mirage owners, I spent a fair amount of time tracking down water ingress areas & alerted concerned folks on the Mirage forum.
So all my recent automotive tinker time has been spent touching up minor rust spots & treating the problem areas with rust-proofing spray.
2) The door bottoms were starting to look pretty bad too:
(Doors since sanded, repainted & rust-proofed inside & out.)
The sheet metal is VERY thin on these cars - best to nip it in the bud or there's automotive Swiss cheese in the near future.
3) Rear lic. plate light bracket
Some idiotic bean counter at Mitsu saw it fit to mount the rear lic. plate lights on an UNPAINTED mild steel bracket behind the rear bumper cover -- a prime road spray, grit & salt accumulation area!
Result: these brackets are literally rusting to pieces.
Solution:
New bracket made out of a scrap of aluminum house flashing. Easy to form & drill. And rust-proof.