Recommended tire pressure for my Lexus RX350?

^ This. Also, I have been pretty disappointed with how the RX handles when the pressure is even slightly off. I tried bumping mine up to 38 PSI thinking I would save some gas on a road trip, but unfortunately the ride was not as good as expected. It felt jittery and honestly made the car feel cheaper than it is. Here is what I noticed from a technical standpoint:

• High pressure narrows the contact patch, which ruins the grip when you are cornering.
• Over-inflating makes the tire act like a basketball, so the suspension doesnt work as efficiently.
• Under-inflating by even 3 PSI makes the sidewalls flex too much, which leads to that mushy steering feel I hate. I eventually switched to Michelin Defender LTX MS 235/55R20 and they are much more forgiving. I keep them at exactly 33 PSI now. Ngl, trying to chase fuel economy by over-inflating just isnt worth the loss in comfort.

Saw this earlier and honestly just wanted to mention that being careful with the pressure is so important for safety. Sticking exactly to the 33 psi on the door sticker is usually best... going even a few pounds higher makes the car feel kinda loose on the highway which is scary.

• Make sure to only check the pressure when the tires are cold. Driving even a mile warms them up and gives a wrong reading.
• Be careful relying on the car sensors alone. I use a JACO ElitePro Tire Pressure Gauge 60 PSI just to be 100% sure the levels are even.
• If handling still feels off, you might want to consider a tire swap. The Continental CrossContact LX25 235/55R20 is great for wet traction and feels way more planted.
• Another reliable choice is the Bridgestone Alenza AS Ultra 235/65R18 if you are worried about tire wear. Just take it slow and check them every couple weeks, it's better to be safe than sorry with these heavy SUVs!

Late to the party but I had to chime in since I have been pretty disappointed with how my RX handles when things arent perfect. I tried bumping my PSI up to save on gas, but honestly, it was not as good as expected. The car felt jittery and I had issues with it sliding a bit more in the rain. Not worth the risk just to save a few bucks at the pump. Safety has to come first so I just stick to the 35 PSI on the door sticker now. If you are worried about costs like I am, buying the super expensive brands is just too much for my budget. I switched to Kumho Crugen HP71 recently and they have been way better on my wallet while still feeling solid on the road. Another decent budget option is Hankook Dynapro HP2 RA33 if you can find them on sale at a local shop. Just make sure you check the pressure every month because letting it drop too low will kill your fuel economy and wear out your tires way faster than they should, which ends up costing more in the long run anyway.

@Reply #1 - good point! Honestly that door jamb sticker is basically the bible for these cars. Maintaining that specific PSI keeps the RX feeling like a tank which is why I love it! Reliability is everything to me and these cars are just absolute beasts when you take care of the basics. Speaking of reliability, I took mine on a 1500 mile trip last month through the Rockies and it didnt skip a beat. We stopped at this tiny roadside attraction that had a giant ball of yarn, which sounds lame but it was actually kind of amazing. My kids were obsessed with it for like an hour and I ended up buying a weird sweater from the gift shop that I still havent worn because it smells like mothballs... anyway lol sorry I kinda went off topic there

Lexus RX350 owner here. Always follow the tire pressure listed on your driver's door jamb sticker, not the sidewall maximum. For the RX350, it's typically around 32-35 PSI front/rear. I've found maintaining this pressure year-round works best, but check monthly as pressure drops about 1 PSI per 10°F temperature decrease. Slightly higher pressure (2-3 PSI above recommendation) can improve fuel economy but may sacrifice ride comfort. Lower pressure gives a smoother ride but accelerates tire wear and reduces fuel efficiency. For optimal handling and even wear, I rotate my tires every 5,000 miles and maintain consistent pressure across all four.