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:
Speed limit exceeded
The warning light on the dial turns on (on certain versions together with the
message on the display) when the car exceeds the speed limit set previously (see
“Reconfigurable multifunction dis ...
Steering Wheel Audio Controls
The remote sound system controls are located on the rear surface of the steering
wheel. Reach behind the wheel to access the switches.
Remote Sound System
Controls (Back View Of Steering Wheel)
...
Engine
GENERAL FEATURES
(*) For specific markets where applicable
FUEL SUPPLY/IGNITION
Petrol versions
Electronic Multipoint sequential phased injection integrated with ignition,
return less
syst ...