I agree, hybrid driving is a unique experience. The difference from a diesel car is also given by the fact that power is given in a linear way, so you don't perceive it like a sudden impulse like in a diesel where the power is (more or less) the same for a large range of rpm. Besides, in diesel you fell the need to change gear, while in Lexus there are no gears to change :), and you can keep any speed witth engine at the right rpm, or off is speed is slow moving with only electric automatically, even at almost 0 speed up a hill.