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:
Deactivation
Turn the ignition key to STOP.
At the following starting operation (key at MAR), the sensor will not be reactivated
even is the stalk is on (B). In this event, to activate the rain sensor, you have ...
“Dualdrive” electric power steering system
The electric power steering only works when the ignition key is at MAR and the
engine is running. A new electrically controlled power steering system called “Dualdrive”
is fitted on the Fiat Pun ...
Cheap running that respects the environment
Environmental protection has been one of the guiding principles in the production
of the Fiat Doblò. It is no accident that its pollution control equipment is much
more effective than that ...