That is standard good driving for economy in any car. The advantage of the hybrid, in my limited experience, is that a light touch on the throttle gives you battery power only. The hybrid just seems to be easier to drive in this way - it feels more natural, without really trying too hard. The other advantage, as you say, is when you do have to brake some of the energy is put back into the battery. I am still blown away with this (old my car) technology.
The RX 400h and RX 300 cars are totally different beasts - both cracking cars but very different. I love the CVT box on the 400h and the mpg is much better.
Just my opinion.