My 2015 LS460 with no air suspension has the 19 inch sport wheels.
The car rides nicely, but I noticed the tires are at 39 lbs. I am not sure what the factory setting for these is.
Will my ride improve noticeably if I reduce the pressure to what tires are normally at- 32 lbs. or so?
Will the tires wear more quickly, and do I need to recalibrate the tire pressure monitor setting or something like that?
Thanks.

 

Oops. 2012 LS460

 

Check the plate on the door sill for tire pressures. I'm not sure what they are for the 19s, but for my 18s it says 33 psi.

 

Mine are usually set to 31. By the time the tires get hot it goes to about 35.

 

If your tires are at 39 psi when cold, then they are a bit on the high side. As Dave said, check the plate on the door and try the tires at the recommended pressure. You shouldn't need to recalibrate the TPMS.

 

I run my 19s at 31 cold. Ride will improve noticeably if you air down from 39 cold.

Door sticker says 33 cold.

 

Terrific!
33 lbs. will feel like the poor man's air suspension after banging around at 39.

 

Even though your gasoline MPG will drop a couple of miles, the ride and handling will be smoother along with a more even tire treadwear as the higher pressure bulges out the center of the tire tread making the car ride on mostly the center treads.

 

I don't know, maybe the previous owner overfilled them intentionally to enhance mileage, as he is a snowbird and drove back and forth from SC a couple times per year.
I thought it was a bit unusual, but figured the tire pressure monitors were properly configured and that's where they should be?

 

 

The tire monitors may only warn of low pressure (perhaps from a flat tire) instead of high pressure. If the snowbird was doing mostly highway driving, then the higher tire pressure would definitely increase the MPG while the highway roads tend to be smoother for a less harsh ride than bumpier city streets. Just have to watch out for hydroplaning at the highway speeds during a rainstorm which likely happen less during the winter months.