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 are not needed under normal conditions and would result in additional cost.
Therefore you should not have to add anything to the fuel.
See also:
EVIC Units Selection (Units In Display)
Displays the units used for the Outside Temperature, Average Fuel Economy and
Distance to Empty features.
Press and Release the SELECT button to toggle units between U.S. and METRIC . ...
Extreme Cold Weather (Below –20°F Or –29°C)
To ensure reliable starting at these temperatures, use of
an externally powered electric engine block heater (available
from your authorized dealer) is recommended. ...
Chassis
...