What's interesting about those 3 cars is that while they are hybrids, they don't leverage that technology to increase economy; they use it to increase power. There are real, physical limitations involved in gasoline engines and the electric motors are used purely to compensate for those limitations (time it takes for a throttle to open, fuel and air to mix, and ignite--the time it takes for a transmission to change a gear. These things can be made ultra-fast; but, they cannot be eliminated).

BMW did a very similar thing with their 330e model; the electric motor is primarily used to increase the power from the relatively small engine that is normally only on the lower-end 320.