I've recently been using SimCityPak to sift through the game files while comparing them to the in-game descriptions, and I only have a rough understanding of some of the game's logic and numerical settings. I only know that some of the commented-out values are actually just for display; modifying these values won't change anything during gameplay. For example, the garbage truck's capacity needs to be adjusted by modifying the agent's (the garbage truck itself) attributes, not the unit's (the garbage truck garage).
Also, since English isn't my native language, I apologize for any reduction in communication efficiency caused by relying on translation software.