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:
General warnings
Failure indications shown (only for some versions) on the reconfigurable multifunction
display together with buzzer sounding (adjustable) and warning light (if any) coming
on on the cluster, are a ...
Rev. counter
The rev. counter shows engine rpm. The needle pointed to the danger area (red
on certain versions) indicates excessive high engine speed. Do not drive for long
periods with the needle in this ar ...
Left-hand and right-hand direction indicator
(green - intermittent) (Natural Power versions)
The warning light turns on when the direction indicator control lever is moved
downwards or, together with the right indicator, when the hazard war ...