I just bought a 2015 RX F-Sport, it has the Michelin Latitude tires, the tires were all filled to 35lbs. I lowered them to 32 even though the door panel shows 29lbs. I haven't driven it yet but I came from an LS460 which I thought was too soft of a ride.
I tested out the lower tire pressure last night, hwy, mountain roads and dirt road, ( all within in 10mi of me) and it did make a difference. Smoother and quieter though I suspect gas mileage will suffer a little. This is a brand new car and I don't understand why the dealership would put 35lbs in the tires when the door jam sticker says 29lbs, maybe for the gas mileage?!?!?
I thought about dropping the pressure to 30lbs but at 32 it feels fine.