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 (Speed Lim.)
With this function it is possible to set the car speed limit which, if exceeded,
automatically sounds a buzzer and makes the warning light è with the special message
on the display (see “Wa ...
Recommended Shift Speeds
To use your manual transmission for optimal fuel economy, it should be upshifted
as listed in the following table
...
Wheels
RIMS AND TYRES
Pressed steel or alloy rims. Tubeless tyres with radial carcass. The homologated
tyres are listed in the Log book.
IMPORTANT In the event of discrepancies between the information ...