dlcrow

I have a new 2014 Silverado Crew Cab LTZ Z71 and replaced the 20" chrome wheels and tires with MB TKO wheels and 275/65R18 BF Goodrich All-Terrain T/A KO tires from Discount Tire. They put 40 PSI in the tires. Is that correct or optimum? I have the same tires on my son's 2010 Silverado LT regular cab and they set his at 35 PSI. 35 PSI is also what I had always set the same tires (not sure if the size is exactly the same) on my 2002 Z10 Suburban.