Woah! That is the MAX not the running pressure! 65 psi MAX COLD pressure is the highest safe pressure that tire can run. 35 psi should be plenty on a 1/2 ton with C load range or lower (P rated), 40-45 on a 3/4 with D load range or lower, and 45-65 on a 1 ton with E load range or lower. What I do is balance it out better for winter where I am not hauling anything. So I actually run 36 psi up front and 34 in the rear to keep the front off the sidewalls and the rear from bouncing around.
99' Silverado 5.3 4X4
Modified Predator 93 tune: TQM @ 40%, injector slope bumped up 4 levels,
125 MPH top speed, 5500 RPM limit,
TBS, 180 thermostat, 4" CAI with 9x6" element,
Bypass and De screen performed,
AVG: 16 MPG City, 20 MPG Highway
damn looks like i may to need to inflate some more.
89 silverado new 5.7, rebuilt700R4, RCLB Debadged, 16x8 torque 2s in LT265/75/16 BFGS, 2.73s , opened up intake, airade tb spacer, headers with dual high flow cats and 40 series dumped, audiobahn spkers with memphis 10s to a rockford amp.
The "P" you refer to indicates that it is a Passenger tire,as opposed to a "LT" light truck tire. "P" tires have lighter construction and fewer sidewall belts, and are intended to run at lower pressure as well as handle less weightthan a "LT". My 2002 Silverado 1500 Ext Cab Z71 came from the factory with P265/75/16 tires and the door tag confirms that info and all 4 should be set to 35PSI COLD, again COLD,Stone Cold,not driven as much as 2 blocks to the filling station. Just a very short distance raises the temp of the tire and can change the pressure considerably. Both of my vehicles will change 3-4 pounds in the distance from home to the gas station(approx 1/4 mile) and my Truck with 400-500lbs in the bed going 20 minutes on the freeway changed 8psi last fall. The sidewall pressure tag is the MAX reccomended COLD PSI. All that being said I regularly 38PSI in my SIlverado "P" tires year round, rides alittle harder in the winter,but tires wear more evenly than the same brand/model did at 35PSI ans the Gas Mileage is Slightly better. As a side note a few of my friends have been running "C" load "LT" tires on the 1500 Chevys( at 50-55PSI)and although they ride TOO firm for me, they have consistantly been gettingMPG and the tires are lasting between 80-120K. One buddy had his rims/tires stolen off his brand new 2004 1500 before he even took delivery and had the dealer put Michelin "LT"'s on it, now has128K on it, the tires passed inspection,but weren't really up to this Notheast winter.
2002 Silverado ECSB Z71 5.3/4L60E/Pushbutton 4WD,265/75R16,3.73 G80,Wait4ME Tune,Vararam VR-3 T-Body Velocity Stack,Drop in K&N Air Filter,ScanGauge,Stage1 GM Alternator Voltage Booster,1500HD Cluster(w/Trans Temp Gauge),DUHA underseat storage box