Recommended shifting speeds
Subaru Impreza / Subaru Impreza Owners Manual / Starting and operating / Manual transmission – 5 speeds (except 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:
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This light shows that the headlights are in the high beam mode.
This indicator light also illuminates when the headlight flasher is operated. ...
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For the recommended cold tire inflation pressure for your vehicle’s tires, refer
to “Tires” F12-8. ...
For AT models
This light flashes if the vehicle is driven with tires of different diameters
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