This tyre pressure placard sticker was taken from a Lexus RX400 235 55R18 and the tyre pressure placard lists standard air pressures, laden tyre pressures and in some cases even have an "Eco" (Economical driving) setting.
The Eco or Economical driving tyre pressure setting is there to help increase fuel economy but in some cases can sacrifice comfort making the vehicle a harder ride. The increased air pressure in the Eco setting could also increase tyre wear to the centre of the tread but this is not always the case. Some drivers have reported a slightly lighter steering feeling and a very slight decrease in vehicle stability when using the Eco pressure.
The actual tyre pressure placard stuck on your vehicle is the most accurate listing of the tyre pressures for your Lexus RX400 235 55R18, so if you are looking to find where the tyre / air pressure settings are for your vehicle then the placard is the best thing to look for.
Not all Lexus's have a placard attached to the vehicle, if this is the case then you would need to find the vehicles hand book for the correct air pressure listing.
If you cant find your hand book and your vehicle doesn't have a readable placard attached to your vehicle then you could try our looking at our Lexus Tyre Pressure Index for your vehicles tyre pressure.