Should the fuel cost be included in the pricing?
It's up to you to choose whether or not you want to include the fuel cost in the pricing. Make sure to let your renters well informed, you should specify if the fuel is included or not in the description of the yacht. This option is located in the "Feature" section of the "Add Boat" page.
In most cases, boat owners decide to set the "Renter Pays" option - the boat is available for the booking with a full (fuel) tank, and the renter must return it with a full (fuel) tank too.
If you consider not to include fuel in the pricing, it highly is recommended to state the average price of a full fuel tank for your boat. Furthermore, you can specify how much it would cost the renter to return the boat without fuel in it.