Our gas mileage has never been as advertised.
We bought our RX400h with 8000 miles on it in Sept 2006.
It was 1 yr old, the prior owner traded it in fast and took a $20k loss on the trade in.
We have always averaged 26.2 mpg in a mix of city/hiway driving.
We had the hybid inverter module replaced in Feb 2012.
Our gas mileage then plummeted from 26.2 to 23.4 mpg.
We suspect that Lexus reprogrammed the engine management computer to use the gas engine more and the hybrid less so as to extend the life of the batteries and inverter.
This way, they won't have to make so many expensive warranty repairs.
Please let us know if you saw the same thing with your mileage.
AC outlet in rear.
Back up camera.
Bluetooth connect to cell phone for hand free driving.