What part of speech is the word mileage?

The word "mileage" can be a few different parts of speech depending on how it's used in a sentence:

* Noun: This is the most common use. "Mileage" refers to the distance traveled, especially by a vehicle. For example: "The car's mileage is very high."

* Adjective: "Mileage" can be used as an adjective to describe something related to distance traveled. For example: "The car has great mileage."

Let me know if you have a specific sentence in mind, and I can help you determine the part of speech!