Garmin G3X Pilot's Manual page 191

Plan Fuel Field
Adjusting the Saved Flight Plan speed and fuel:
1) Press the FPL Key and turn the FMS Joystick to display the Flight Plan List
Page.
2) Press the FMS Joystick to activate the cursor, and turn or move the FMS
Joystick to highlight the desired flight plan, and press the ENT Key. The
Saved Flight Plan Page is displayed.
3) Move the FMS Joystick to the 'Plan Speed' field.
4) Using the FMS Joystick, enter the desired speed, and press the ENT Key.
5) Repeat steps 3 and 4 for 'Plan Fuel', and press the DONE Softkey.
190-01115-00 Rev. J
Plan Fuel (Active Flight Plan Page)
Garmin G3X Pilot's Guide
Flight Planning
171