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Correct it is a single channel so 60/70/90 psi in ALL wheels depending on which system they have.

If they haven't gotten the Updated ECU which puts tire pressure at 70psi for non-wreckers and 90psi for wreckers See http://psmag.radionerds.com/images/7/70/PS_Magazine_Issue_726_May_2013.pdf for the whole monthly magazine and attached is a screenshot of the pages taking about the updated...

There are known cases where tires have failed at below rated speeds by members of this site.

During my wife's (Beast) and my (Beast II) drive yesterday to and from Ogden UT for a car/truck show with both trucks we where most happily cruising along at 50-55 mph with a couple of spots where we did get up to 60 with both trucks capable of doing faster (Gov Springs & Fuel turned up) but we...