I can't believe that they would want you to run with the higher pressures listed in the chart during colder weather. Yes as it gets colder your pressure drops in your tires. That is why you add more air to compensate and bring the pressure back up to the correct amount but not the higher pressure listed in the chart. Wouldn't the manufacture list this information on the placard as well if it was correct? I think maybe the chart has a baseline of 70 degrees and if you were to fill a tire to say 32 lbs at 70 degrees it would lose roughly a pound for every 10 degree drop in temperature. Now if at 70 degrees you over filled the tire to 39 lbs and then lowered the temperature to 0 degrees it would be at 32 lbs. That is how I interpret it anyway.