PSI on door frame vs on tire?

on my 2018 pro, sticker said 30 PSI, but on the tires 51 PSI max. run on stock tire 265x70x16, any idea which PSI pressure?

 

Use what it says on the door. The tire psi is the max psi.

 

thnx Gray.

 

Use the door jamb pressure. That's the factory spec for your vehicle (assuming you have the original spec tires on).

 

thnx Hobbs.

 

This might be interesting to you

https://m.tirerack.com/tires/tiretech/techpage.jsp?techid=8

 

I've seen the chalk test recommended several times.

I have not tried that but did increase my pressure from 29 to 32 and found the ride smoother and the mpg improved.

 

Chalk test to find perfect PSI.

Higher PSI will always improve MPG but too much pressure could cause uneven tire wear

 

Thus the chalk test right?

I haven't done it cause I'm secretly hoping to prematurely wear the POS tires the dealer installed before I purchased my Taco a couple months ago so I can justify a set of Cooper Discoverer AT3 4S.

So far I haven't noticed any uneven wear and I think the manufacturers often under inflate intentionally for a softer ride.