Recommended shifting speeds
Subaru Impreza / Subaru Impreza Owners Manual / Starting and operating / Manual transmission – 6 speeds (STI) / Shifting speeds / 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:
Audio control buttons (if equipped)
Type A audio
Type B audio
These buttons are located on the spokes of the steering wheel. They allow the
driver to control audio functions without taking his/her hands off the steering
wheel. ...
Selecting preset stations
Presetting a station with a preset button allows you to select that station in
a single operation. Up to six AM, FM1, FM2 and FM3 stations each may be preset. ...
Fuel
...
