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:
Spark plugs
The cleanness and soundness of the spark plugs are very important for keeping
the engine efficient and polluting emissions down.
The appearance of the spark plug, if examined by an expert eyes, is ...
Values Displayed
Range
This indicates the distance which may be travelled with the fuel remaining in
the tank, assuming that driving conditions will not change. The message “----” will
appear on the display in th ...
Acceleration
Rapid acceleration on snow covered, wet, or other slippery surfaces may cause
the driving wheels to pull erratically to the right or left. This phenomenon occurs
when there is a difference in the ...