I don’t gas my Mercedes
After midnight, I treat it like a Mogwai
Cause it will turn into a Gremlin and run over kids

from Eminem – Untitled Lyrics on Rap Genius

Meaning

Even though Eminem has a powerful, German car (rather than a cheap, crappy Gremlin automobile), he pushes the pedal to the metal

Em knows not to gas (feed) his Mercedes (nicknamed “Mogwai” — the Gremlin from the movie) after midnight, or it will turn into a Gremlin (automobile)

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