On the other hand, newer Hybrids are using Atkinson-cycle engines to get greater efficiency from a gasoline engine at the expense of power. They're more complex because the pistons are connected to the crankshaft via a series of levers instead of directly as in the Otto cycle. This allows the engine to run with a longer power stroke, hence the efficiency gain.
What? Atkinson would be turning over in his grave! Toyota and others are telling a lie to get around the Miller cycle patents that they really use. No extra connecting rods in these engines, just a late closing intake valve.