I have the standard 18" Lariat wheels on a 4x4. BF Goodrich Rugged Trail T/A 275/65 18.

I've noticed that all 4 tires seem to lose 5 or 6 pounds of pressure every 2 months or so. This seems like a lot to me. It's enough to make the truck handle like crap and not ride as well as it should. Anyone notice this on your truck? Ha anyone tried the nitrogen in your tires to see if they hold the pressure? I'd hate to have to keep putting air in the tires way too often.

 

I'm not an expert on that, but I think it's normal. Temperature changes I know can effect the tire pressure. It goes into full detail in the owners guide.

 

I've got the same setup you do lariat (albeit FX4) and mine have only been losing about a half pound or so each 3000 mile oil change.

Assuming you are consistently checking them cold, I haven't seen that sort of pressure loss ever.

Do you have a disgruntled ex-wife?