plate in door will tell u the recommended pressures. dont just run at the max like some people, thats just stupid imo. ill run mine at like 36 usually. if a lot of bad snow and ice driving, ill go 34. or course bigger rims, bigger tires the recommended will be different.
2001½ F150 5.4 XLT Crew Cab- 3.55 gears and towing package, true dual glasspacks with x-pipe, AEM intake, SCT X3 with VMP custom tunes, E-fans conversion, full stereo system, HID 55w heads & 35w fogs, 35% tint front & 20% rear, Lightning head lights & tail lights, all interior & exterior bulbs LED