How to add fuel while on the ground.

Question

On a long distance flight with scheduled stops, how do you top-off the gas tanks in the Cessna 172 ?

Answer 1

I assume you are referring to X-Plane 11.  If so, click "Flight" in the upper left drop-down menu, then click "Edit Weight and Balance".  Use the slider to increase fuel.  Be careful not to over-fill the plane!