What is the estimated highest mileage a 1985 Chevy Nova can have?

There's no definitive answer to the highest mileage a 1985 Chevy Nova could have. Mileage depends entirely on maintenance, driving habits, and luck. While some might have incredibly high mileage (potentially over 500,000 miles with extensive rebuilds and repairs), it's exceptionally rare. Most 1985 Novas are unlikely to have anywhere near that mileage due to age and the general wear and tear that comes with it. A well-maintained car might reach 200,000-300,000 miles, but anything beyond that would be quite unusual.