Tune up milage on 2008 Ford Explorer Sport Trac

Like at what milage should i get a tune up for my 08 Sports Trac

2 answers
With respect to Roy, I would recommend replacing the spark plugs at the 60,000 mile interval as listed in "Severe Duty" schedule. Earlier removal of plugs seems to be a better idea for ease of service.
90-100k is the reccomended interval.