Nissan claim to be the first carmaker to be able to apply it to production engines and you will find it on the MR16DDT engines that go on Renault Clio's and the Nissan Juke's.
Put simply, it's not an easy chemical process to do. Nissan say they are the first to do it.
The MR16DDT isn't that economical as it's more oriented towards power. But I've been in cars with them in and the engines do feel very much smoother than conventional non-treated engines so I have to admit that I think they have achieved what they are claiming.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius
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