Having a vehicle mileage feature in FS25 is a useful addition for tracking the distance traveled by each vehicle. This can be beneficial for monitoring fuel efficiency, maintenance schedules, and overall usage patterns. With the mileage being saved automatically, players can easily keep track of their vehicles' usage over time. Additionally, displaying the mileage above the working hours makes it convenient for players to access this information at a glance. It adds another layer of realism and detail to the gameplay experience, allowing for more informed decision-making when it comes to managing their fleet of vehicles.