[sourdough]

Outside temps have an effect on tire temps. Hotter = higher, lower = lower temps. Air them up when they are cool, haven't been on the road, to the indicated pressure. From there realize that as the day gets hot so do the tires. Hot pavement makes it even moreso. When things start cooling down, or you stop driving, the tires cool off. With those increased temps you will see some increase in tire pressure, same with cooler temps. Air them up when they are cool using a good temp gauge. For reference you can then look at your tpms to see where it stands vs a good gauge and just log it in memory. From there just watch the tire temps/pressures, they will vary up and down. You just watch for variances that aren't normal, particularly one tire hotter, lower/higher than the others. From there just cruise on down the road....