First, I did search the forum, and I know most people like their pressure between 33/35. I have an AWD 14 GS350 Lux. It was finally nice this past weekend, so I busted out my compressor to fill air in my cars/motorcycle's tires. I went to fill up to 38 in the GS bc the on screen display shows that the tires are 38psi. To my surprise, the door sticker says 33 all around. I've only owned my GS for a month, any reason to dealer would over inflate to 38? It isnt just my car, I had a 16 GSfsport as a loaner and i noticed the tires were 38/39psi in my loaner. Anyone elses dealers do this? I left them all at 38 b/c in my 1 month, and 2400 miles of driving, I liked how it felt on the highway and cruising the city. Plus, I average 24.5-26 MPG combined. I have stock Michelin tires and stock luxury wheels.

Thoughts?

 

Typical dealer thing. Find what works best for you. I would think 38 would ride a little harsh.

 

I keep my '13 GS at 33 psi all the way around as recommended on the door plaque. The ride and handling is excellent at the recommend pressures. I see no good reason to change. As mentioned, 38 psi will give you a harsh ride. Lower pressures than recommend will result in increased tire wear. When I take my car in for service I tell them to leave my tires alone. From past experience they always tend to over-inflate them.

 

My dealer tells me they inflate higher in the colder weather months because tire pressure changes with the ambient temperature. Now that is warming up you may want to drop the pressure a little.

 

I keep my 14' at 35 psi in the winter and when it's summer I will low it down at 33 psi

 

I go 34 psi in the winter (not so cold here) and 32 psi in the summer for the cold setting, the tire seem to run 35-36 psi when they're warmed up

 

On my 2016 F Sport, I have them at 35/36 psi in the morning when I start the car before 7am year round here in SoCal. They go up to about 40/41 psi in the afternoon or when I'm driving for a while, sometimes up to 42/43 when I go to Vegas during summer on my 2015. They both have same factory Bridgestone tires.

 

I got perfect tire wear running 41psi front and 38psi rear. Mostly interstate driving.

When I tried the sticker recommended 36/35, my outside got eaten up due to low pressure.
Running 41 in rear ate up my center slightly faster than the outside.

2016 F-sport 350 RWD with Potenza RE050A
Bridgestone recommends running 41psi for GS (bare minimum 35psi)

 

33-36 is a good range for me. When the tires are cold, it's around 33-34 but after they heat up after a good drive they move up to 35-36. All feels great to me!

 

I know most people are aware, but those pressures are for cold/rested tires. I keep by F Sport 35F/36R and when driving for longer periods of time the pressure readings go up to 38-41psi.

 

I have a 2002 SC 430 and tires are 245/40ZR 93W on rear tires and 275/35ZR 18 22W on front tires. How much tire pressure do I need?

 

It's different for each vehicle based on weight/load.There should be a panel/label just inside the driver's side doorwell that tells you the recommended cold tire pressure for your vehicle (or is in your owner manual if you have it).

 

This shows the typical tire ignorance of the majority of people, auto mechanic's not excepted. Tire psi specs are @ assumed 70 degrees & changes 1 psi for every 10 degree change, upper or lower. So it sounds like they were inflating GS tires to 40psi.Imagine hitting a pothole like that.

 

Recommended tire pressure is NOT based on 'assumed 70 degrees' as you say. Recommended tire pressure is based on the expected ambient temperature in which the tire will be driven, which could be literally any temperature from [say] -50° to 130°...not 70 degrees.

See the below attachment for Lexus' 'Tire Pressure Inflation Compensation and Adjustment' document.

.

 

that's a great attachment. Thanks.