Materials Added To Fuel
All gasoline sold in the United States is required to contain effective detergent additives. Use of additional detergents or other additives is not needed under normal conditions and they would result in additional cost.
Therefore, you should not have to add anything to the fuel.
See also:
Cooling System Pressure Cap
The cap must be fully tightened to prevent loss of engine
coolant (antifreeze), and to ensure that the engine coolant
(antifreeze) will return to the radiator from the coolant
recovery bottle.
...
Seat Belt Lock Out
The center rear seat belt system has a lock out feature that
will not allow you to extract the center webbing unless
the rear seat upper latch is engaged. ...
Interior Lights On
Rotate the left dimmer control completely upward to the
second detent (extreme top position) to turn on the
interior lights. The interior lights will remain on when the
dimmer control is in this ...