Demanding driving

In demanding driving conditions, such as operating the vehicle in hot weather, towing a trailer, or driving for extended periods at higher altitudes than normal, it may be advisable to switch to higher octane fuel (91 or higher) or to change gasoline brands to fully utilize your engine's capacity, and for the smoothest possible operation.
NOTE
When switching to higher octane fuel or changing gasoline brands, it may be necessary to fill the tank more than once before a difference in engine operation is noticeable.
See also:
High/low beam headlights
Headlight switch and lever
1 - High beam flash
2 - Toggle between high and low beams
High beam flash
Move the lever toward the steering wheel to position 1. The high beams come on
until the ...
Fuel filler cap
The fuel filler door, located on the right rear
quarter panel, is connected to your vehicle's
central locking system. ...
Unleaded fuel
Each Volvo has a three-way catalytic converter
and must use only unleaded gasoline. U.S. and
Canadian regulations require that pumps delivering
unleaded gasoline be labeled "UNLEADED". ...
