That's why I will go down to 35.

Thanks to all for the help.

Don't go by the tire max, as many have stated. I belive the T4R says 32 psi. I keep it at 34 on the road. I never go over 35 and try to never let it drop below 32. It rides pretty well and I still get 18 mpg. I tried 38 psi once it it felt pretty harsh and abrupt...not going to do that again.

The tire max is simply the max air the tire can handle based on max load. Usually, one does that when towing something heavy or driving a heavily loaded vehicle. At least, that is what I was told.

Wow...so many different answers. The specs are on the door jam and owners manual for a reason. I run 32 psi. I check them each week and adjust accordingly. The 44 psi on the tire is what never to exceed per the tire, not the vehicle. My tires are wearing perfectly.

You may find the same tire/size on a range of vehicles that vary in size and weight. Most people look at the tire and read ONLY the first part...MAX Tire Pressure 44psi...and completely ignore the second part @2000lbs (or some other number...depending on the tire). That means that for a vehicle that weighs 8000lbs (2000 * 4) you want the pressure to be 44psi. Since our 4runners don't even come close to 8000lbs you don't want the tire pressure anywhere near 44psi.

Auto Manufacturers tend to like a softer ride. But if you want a little firmer ride a little margin of error...then increasing the pressure by 2-3lbs is a good idea. I usually set mine to 35psi. With this extremely warm weather it was reading 37psi so I reduced the pressure back to 35psi. When the temps drop again I'll probably have to add a couple lbs of pressure.

Yes, I agree with you. Basically whatever the door jam says but you canadd 2-3 lbs more. I can't believe some people go by the tire's max pressure. That has nothing to do with how much you inflate it when it's mounted on a 4runner in this case. For example, the exact same tire on a jeep may call for 33 lb, but on a toyota it is 32lbs. Someone said the 32 is because it's based on the original tire. This is not true at all because on my 4runner the original were michlines and the max was 40 something. I think the easiest way to think of this is, tire manufactures have no idea in what car you are going to mount the tires on so they just tellls you the maximum pressure the tire can handle and nothing more

Toyota engineers go through various testing with different tires mounted on the 4runner and 32 is the happy balance for comfort and performance.

This one is debatable, but I always like to go higher with my PSI. The ride may be rougher, but it helps with tire wear, but you also have to be careful that you don't over inflate, as this can cause uneven tire wear.
But it also helps in the mpg department....

It has EVERYTHING to do with weight (weight of the vehicle).

The Benefits of Correct Air Pressure - Discount Tire


You can actually weigh your car by just measuring each of the tires footprints and psi. The more air you have in the a tire the less footprint. It's an interesting science experiment.

Illuminations: Weighing Your Car

As a very happy, brand new T4R owner (2017 LE) I am planning a 1500 mile road trip over the next few weeks. I have the original Bridgestone Dueler H/T 684-II tires. From this old thread, I see that it is OK to add a couple of psi to the recommended 32 psi but to stay significantly below the maximum. If the truck is going to be loaded with perhaps 500-750 lbs of baggage and equipment for my trip, should more air be put in the tires or should I stick to the 32-35 psi range?
Thanks

i say just keep the psi at 34. i had ran 40 but thats when i had 22s with a thinner tire.

Most accurate way is to do the chalk test with the weight in the vehicle
https://www.youtube.com/watch?v=ojGsavK0Uwc

But yes, you'll prob. end up with extra PSI. Results will vary based on how stiff your tire is and your actual cargo weight.

I appreciate the information. I will use 34 psi for now and when I can find the time, I will do a chalk test.
Thanks,

My tires say LTX which has me wondering about pressures too.

I plan on definitely doing a chalk test soon without any cargo, just to get a baseline to work from. Thanks for the link. Had one other question though. I have a 2018 4runner TRD ORP w/KDSS and stock 265/70/17 Bridgestone Dueler H/T D684II tires. Dealer had them overinflated so I dropped them down to about 36 since I'm doing mostly paved road driving right now. I noticed that there is a somewhat noticeable sidewall bulge on all 4 tires where they contact the pavement. I assume this is normal, but just looking for confirmation I guess. I had a 96 Jeep Cherokee, second owner, took it up to 275k, but got a sportier car with low profile tires after than and before this, and the wider, low profile tired tend to "look" a bit overinflated.

lol at all the folks saying they run 32psi because that's what it says on the door jam, as if that's what the supreme, all-knowing, all-power Toyota engineers had spec'd the vehicle to use. Any more pressure and the tires will be too tall which will cause the driveshaft slip joints to bottom out! Or something

I run 40 psi because it gives me better fuel economy.

V8 here, I run Michelin LTX AT2 tires and barely see anything off the pavement. Keep them inflated at 40 PSI. I don't have any extra armor or bumpers, completely stock body.