text: initial weight of the airplane will require spe- 
  cific values of airspeed, altitude,’ and power 
  setting to produce the recommended cruise 
  condition. As fuel is consumed and the air- 
  plane gross weight decreases, the optimum ai,r- 
  speed and power setting may decrease or the 
  the 
  optimum altitude may increase. Also, 
  optimum specific range will 
  increase. The 
  pilot must provide the proper cruise control 
  technique to ensure that the optimum condi- 
  tions are maintained. 