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:
Driving Impressions
Understated and elegant, the S80 is spacious throughout and delivers a
smooth, easy ride. Automatic-transmission shifts are smooth yet noticeable. The
easy-to-drive S80 promises excellent control ...
Design Concept
The Volvo S40 is a tribute to Volvo's talented and multi-cultural design
teams in Gothenburg, Barcelona and California, who have captured the premium
values of a contemporary Volvo saloon in a com ...
Steep inclines and/or heavy loads
ACC is primarily intended for use on fairly level
roads. The system may have difficulty maintaining
the correct distance to a vehicle ahead
on steep inclines, if the vehicle is carrying a
heav ...
