It beats me why Holden are yapping about a MASSIVE 25% increase in efficiency when they could be talking about 40% as here!

<<Velozeta six-stroke engine

In a Velozeta engine, during the exhaust stroke, fresh air is injected into the cylinder, which expands by heat and therefore forces the piston down for an additional stroke. The valve overlaps have been removed and the two additional strokes using air injection provide for better gas scavenging. The engine seems to show 40% reduction in fuel consumption and dramatic reduction in air pollution.[7] Its specific power is not much less than that of a four-stroke petrol engine.[7] The engine can run on a variety of fuels, ranging from petrol and diesel to LPG. An altered engine shows a 65% reduction in carbon monoxide pollution when compared with the four stroke engine from which it was developed.[7]>>

The Velozeta engine features are:

* Reduction in fuel consumption
* Dramatic reduction in pollution
* Better scavenging and more extraction of work per cycle
* Lower working temperature makes it easy to maintain optimum engine temperature level for better performance
* The six-stroke engine does not require significant modification to existing engines.
* Better cooling due to additional air strokes, which mostly removes the need for a cooling system
* Lighter engine

Besides the obvious need to develop fuel cells for effective electric cars.. I can't add anything to the above ... it speaks for itself.