It looks like you are creating a database of info about cars - of car models? or of car instances?
Either way, I think that you need at least two classes - a CarDatabase and Car.
Info on individual cars should be stored in instances of class Car.
Class CarDatabase should have a collection (array or hash) of Car instances, and methods for loading info from datafiles and storing it back to datafiles, a.k.a. serialization, and methods for searching, filtering, listing, e.t.c.

Rudif

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