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 would result in additional cost. Therefore you should not have to add anything to the fuel.
See also:
Front light units
The front light units contain: sidelights, dipped beam, main beam and direction
indicator bulbs.
The bulbs are arranged inside the light unit as follows:
(1): sidelights/main beam headlights;
( ...
Driving style
Starting
Do not warm the engine with the car at a standstill or at idle or high speed:
under these conditions the engine warms up much more slowly, increasing electrical
consumption and emissions ...
Supplemental Driver Side Knee Air Bag
The Supplemental Driver Side Knee Air Bag provides enhanced protection and works
together with the Driver Advanced Front Air Bag during a frontal impact. ...