One factor that effects the ability to run faster and farther is your VO2 Max or your capacity for oxygen uptake, this is your "horsepower". The average Male/Female is 39-45 mlO2/kg min, Very well conditioned athletes run a VO2 of 75-85 mlO2/kg min., the largest influence is out of your control.........heredity. 

Calculating the VO2 requires special equipment a treadmill or cycle. The link in this post will  provide more information on VO2 max ranges based on age and some additional information.

VO2 "Horsepower"

Go run and increase your horsepower!!!!!