Tire Pressure Monitoring System Question

Licreek wrote:
If you don't use a monitor, how often do you check tire pressures? and do you carry an air compressor?

I checked once before leaving for the road and I stopped in the first half hour to just feel the temps. I found out that in the process of checking the pressure a valve would stick and I'd have a low tire. This was the biggest reason for buying the TPMS.

And yes on the air compressor.