I've been running the OEM Dunlops at 36/42 and now have 8,000 km on them going into colder weather. These tires don't seem to warm up much even going fast on hot days, so I want to let some air out to get more traction at between 5 and 10 degrees C. I'm thinking I'll lose 10% and see what happens. Any other Canucks doing this, or folk from Alaska maybe?