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Hybrids get all their energy from a single source; a liquid fuel and the ICE. All the losses generating electricity for the motor are covered by not using the ICE at its least efficient phases. For a net gain in efficiency.
On a closed track at steady speeds, a few hybrids might do an automated pulse and glide between the ICE and motor. Most would just end up using the ICE at a steady load. The fuel economy improvement between the gen2 and gen3 Prius was mainly due to improvements to the ICE's efficiency. A larger ICE was used because it had a better 'sweet spot' at highway speeds.
A Mustang with the 5L V8 got nearly 50mpg on a closed track in a publicity stunt like this one. We don't take closed tracks to work everyday. While I'm sure this diesel will be a fuel efficient commuter, it isn't going to be putting up such track based numbers. I admit most hybrid drivers won't be getting the impressive numbers either, but the Prius and Peugeot will be close, with the Prius being several car class sizes larger.
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