howw many people does the rx 450h awd lexus seat?

The Lexus RX seats five people.

I have the RX400h which is the same body style as the RX450 (looks like it is, at least). A necessary accessory to make sure you can get all 5 people comfortably seated is a roof box. It will dramatically increase your storage capacity, both for family vacation trips as well as the weekly treks to the recylcling center. Make sure the one you get still allows the hatch to open. Finding one was a bit of a challenge.