text: cruise would create a 1 percent increase in 
  specific range in a constant altitude cruise but 
  a 2 percent increase in specific range in a cruise- 
  climb at constant .Mach number. Thus, a 
  higher average specific range can.be maintained 
  during the expenditure of a given increment of 
  fuel. 
  If an airplane begins a cruise at optimum 
  conditions at or above the tropopause with a 
  following data 
  given weight of  fuel,  the 
  
  168 