It's good for endurance but keep in mind the treadmill has a bounce, when outdoor does not. Plus there is a continous motion under your feet that is propelling momentum. If you put your treadmill on a slight incline this might help conterbalance some of this. But it's not the same.
For long distance, look into building your aerobic as well as your Anaerobic thresholds. Aerobic consist of a lot of exersion versus Anaerobic is more stable and low.
When I'm training for Tri's I utilize both. One day I'll be incorporating H.I.I.T(High intense Interval training, look it up if you've never heard of it.) and the next will be advance Anaerobic exercises to increase my time. Eventually your body will be able to perform at high levels for longer periods of time. It sort of merges the two together.
If you want to sprint then you have to sprint. Unfortunately, your treadmill probably doesn't go fast enough to really do speed work so you may have to put in some time at the track. I'd also suggest doing some plyometric exercises to condition your legs like box jumps, stair sprints, squat jumps, etc.
Outdoor running was better training for me then outside. Its a pain but it helps improvement. Also running long distance may help endurance but that's not used for sprints but keep practicing that too.
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It'e very good, shoot for 5 miles.
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