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I wanted to share a simple modification I made to the flight model to make an allowance for the reduced drag from the winglets. In the TorqueSim Discord channel, ProfessorCrash said the range increase is 300nm from 1100nm to 1400nm, a 27% increase in range. I therefore reduced the fuselage coefficient of drag (cd) by 27% from 0.058 to 0.049. I assumed a min cd of 0.025 (Plane Maker manual states a very sleek fuselage has a cd of 0.025) and deducted 27% from the difference between the min cd and the current cd, i.e. 0.058 - (0.27 x (0.058 - 0.025)) = 0.049. In my test flights to date, I am achieving range proportionate with ProfessorCrash's Tamarack performance graph. If you want to try this, the line to change in the CJ525.acf file is: P _body/0/_part_cd 0.049