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I'm pretty sure IMA not being as efficient has more to do with the gas engine itself, seeing that Toyota goes Atkinson on their hybrids as well as downsizing the engine, while Honda only bothers to downsize. Not to mention they seem pretty behind on developing newer valve technology and direct injection. A full parallel hybrid allows for greater regeneration under breaking, and a slightly smaller gas engine, but at highway cruising power you can't really go much below 1.3 liters, which is around what Civic/Prius use.
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