2009 Subaru Forester Owner's Manual - Page 329

11-34 NOTE Maintenance and service . The air pressure in a tire increases by approximately 4.3 psi (30 kPa, 0.3 kgf/cm2) when the tire becomes warm. . The tires are considered cold when the vehicle has been parked for at least 3 hours or has been driven less than 1 mile (1.6 km). . Correct tire pressure (tread worn evenly) . Abnormally low tire pressure (tread worn at shoulders) WARNING Do not let air out of warm tires to adjust pressure. Doing so will result in low tire pressure. Incorrect tire pressures detract from controllability and ride comfort, and they cause the tires to wear abnormally. Roadholding is good, and steering is responsive. Rolling resistance is low, so fuel consumption is also lower. Rolling resistance is high, so fuel consumption is also higher.