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:
Mirrors
Always check that the inside and outside mirrors are properly adjusted before
you start driving. ...
Winter (snow) tires
Winter tires are best suited for driving on snow-covered and icy roads. However
winter tires do not perform as well as summer tires and all season tires on roads
other than snow-covered and icy ro ...
Use of engine braking
Remember to make use of engine braking in addition to foot braking. When descending
a grade, if only the foot brake is used, the brakes may start working improperly
because of brake fluid overheat ...
