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 Dynamics: Chassis
The Volvo S40 combines an engaging, dynamic driving experience with a high
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The Looks
The improvements over the previous generation are of course most noticeable
by simply looking at the S80. I wouldn't call it striking, but it is handsome —
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Driving through water
The vehicle can be driven through water up to
a depth of approximately 16 inches (40 cm), at
a maximum speed of 6 mph (10 km/h).
Take particular care when driving through flowing
water.
Clean ...
