Most miles can be synonymous with the phrases "farthest distance," "greatest distance covered," or "longest distance traveled." These phrases all suggest that a person or object has traveled further than others. Another synonymous phrase could be "highest mileage," which is often used when referring to vehicles or machinery. "Maximum distance" and "maximum mileage" are also useful synonyms for the term. When referring to a person's travel, "furthest journey" and "longest expedition" can also be used. Overall, there are many synonyms for the term "most miles," and each phrase can add a unique perspective or emphasis when speaking about distance and travel.