I’ve been sent links to www.dipetane.net.. According to the website you add dipetane to your petrol or diesel and you get a 10-17percent efficiency increase and reduced greenhouse gas emissions.
According to Wikipedia* it’s a fuel enhancer that improves the quality of combustion of any liquid fuel and it reduces emissions of CO2 up to 25%, CO up to 9.5%, NOx from 28.8% and SOx from 19.9%.
So why aren’t we all using it?
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update 9am, next day
* Apparently this link was to a Wiki user page rather than the Wiki proper and the information was ‘commercial content’ and so John Quiggin has had the information removed, so the link no longer works, see comments from John below. And I’m wondering whether the ‘commercial content’, as repeated in this blog post, is factually correct or not?

Jennifer Marohasy BSc PhD has worked in industry and government. She is currently researching a novel technique for long-range weather forecasting funded by the B. Macfie Family Foundation.