Fuel Requirements - Jeep 2004 Grand Cherokee Owner's Manual

The Tire Pressure Monitor system must be
NOTE:
retrained following a tire rotation. See your authorized
dealer for service.
The suggested rotation method is the "forward-cross"
shown in the following diagram.
STARTING AND OPERATING 221

FUEL REQUIREMENTS

Your engine is designed to meet all emis-
sions regulations and provide excellent
fuel economy and performance when us-
ing high quality unleaded gasoline having
an octane rating of 87. The use of premium
gasoline is not recommended. The use of
premium gasoline will provide no benefit over high
quality regular gasoline, and in some circumstances may
result in poorer performance.
NOTE: 4.7L HO Engines (If Equipped): High quality
premium unleaded gasoline with an octane rating of 91
is recommended but not required.
Light spark knock at low engine speeds is not harmful to
your engine. However, continued heavy spark knock at
high speeds can cause damage and immediate service is
required. Engine damage resulting from operation with a
heavy spark knock may not be covered by the new
vehicle warranty.
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