Other information:
While operating on gasoline with the required octane number, hearing a light
knocking sound from the engine is not a cause for concern. However, if the engine
is heard making a heavy knocking sound, see a dealer immediately. Use of gasoline
with a lower than recommended octane number can cause engine failure and may void
the New Vehicle Limited Warranty...
The tires on your new vehicle provide a balance of many characteristics. They
should be inspected regularly for wear and correct cold tire inflation pressures.
The manufacturer strongly recommends that you use tires equivalent to the originals
in size, quality and performance when replacement is needed...