Recommended shifting speeds
The best compromise between fuel economy and vehicle performance during normal driving is ensured by shifting up at the speeds listed in the following table.

See also:
Cargo area cover (if equipped)
The cargo area cover is provided for covering the cargo area and to protect its
contents from direct sunlight. This cover is detachable to make room for additional
cargo. ...
Spark plugs
It may be difficult to replace the spark plugs. It is recommended that you have
the spark plugs replaced by your SUBARU dealer.
The spark plugs should be replaced according to the maintenance sched ...
Safety
The Insurance Institute for Highway Safety crash-tested the 2008 Impreza, and
the car earned a Good overall rating — the highest possible score — in
frontal-offset, side-impact and rear crash test ...
