I followed the link to the original article, from Newscientist.
I do not see a mention of a 90% decrease in fuel consumption there. Could someone please point out how they came to that percentage?
A quote from the original article:
"The design does away with many of the components of a conventional engine, including pistons, camshaft and valves. This makes it much smaller and lighter than a conventional engine. A car fitted with the new engine could be up to 20 per cent lighter overall, Müller claims. By eliminating losses associated with mechanical components, it will also make cars more fuel-efficient, he says."
I think that pretty much sums it up.
Still a nice invention, though.