Have 295 60 R20 nitto terra grappler tires. Door says 35psi, which seems to be too low. Tires say max psi of 80. Recommendations?

 

I would run 45 minimum just so you don't run into tpms warnings if the pressure drops a lil bit due to cold... At 80 psi it will ride like a wagon and usually not needed that high unless you are towing or hauling heavy stuff... look at the amount of bulging at ground contact is a clue

 

The door sticker is what you should run at all times except for when carrying a load.

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Thanks for the feedback. Ya I wasn't thinking 80! That's what the tire says. Seems like lots of folks run 40-44.

 

Thanks. I am at door sticker now and they look under inflated to me. MPGs are crap too.

 

Ford engineers designed that for a comfortable ride, you can inflate them higher if you can deal with a harsher ride, never exceed what's stamped on the tire itself.

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35 is enough. 45 should still offer a good ride and slightly better fuel economy. Unless towing or hauling I wouldn't put anymore then 45 in the rear, and the front will have plenty at 45 max.

 

I've found that the door post pressure optimizes ride as Rnlcomp said, and every vehicle I've owned has gotten better mpg and tire wear (and usually handling) with a higher pressure. Great example is the current Grand Cherokee, door post says 30...when I got it at only 18k miles the fronts were worn so badly they had to be replaced before I bought it. I ran those tires at max, 35psi, for the rest of the time I owned them and they lasted to over 100k.

That said, mid-40s sounds like a good starting point. Drive it around 5000 miles and check wear; if it's even across the tire you have the right unloaded pressure. If worn at the edges, pressure is too low and wear in the center means too high. These indicators are usually easier to see on the fronts. After you rotate, repeat the process and check all 4 tires. Adjust up and down 3-4 psi at a time until you're happy.

 

Thanks everyone for the responses, really appreciate it. I will try 45 and keep an eye on tread wear. Thanks again. Go Hawks!

 

35 psi is plenty even loaded with those tires. However if you feel more comfortable with 45 that is fine as well. It won't improve your MPGs at this point because the weight of the tire is the cause of that. You'll be fine with either.