Licreek wrote:
So how much do inflations vary? Is the average 100lbs? Before I get a weight should I run at max?
Inflations can vary quite a bit depending on both weights and the installed tire pressure/weight capacity ratings. A load range 'H' tire for instance, can support higher weights than a load range 'F' tire.
In the interim, run at the weights listed on the label on the wall. Do not run at the "Maximum PSI" shown on the tire sidewalls unless they happen to be the same as the chart. That's pretty unlikely though, as it leaves no safety margin at all. Running at the max pressure unnecessarily can lead to a rougher ride and even cause uneven wear on the tires. On the other hand, the leading cause of tire failures by far is under inflation, so err on the high side a bit for safety, just don't over do it.