[jagular]

Higher tire pressure is recommended for high speed operation always. Higher pressure reduces sidewall flex which is the main source of tire heating.

ALWAYS increase tire pressure for full load or high speed operation on any car.

 

[jagular]

Watch your tire pressures as winter approaches. You'll have to add air to maintain that 31psi as regular ambient temperatures drop. Your measured tire pressure will drop 1psi for each 5 degrees C.