- appreciate your frustration, have you talked to KMA to see if they will provide some coverage? Or take it to a audio specialist shop to have it checked.
It's not exactly fine print as the warranty book clearly states what is covered and what is not, which you should have read shortly after getting the vehicle.
Buying most other brands would not be any different as there coverage is most cases is 3 yrs or 36,000 miles - the Dart for example that you mentioned, also their power-train warranty is 5 yrs or 100,000 miles.
You need a warranty that doesn't restrict on mileage due to your extremely high mileage. Mazda Canada has now gone in that direction but not the US.
Maybe join us over on the Soul Forum Kia Soul Forums :: Kia Soul Owners
as we have lots of active members in North America and maybe they can offer some suggestions with regards your problems - worth a try.