I have been looking at this product and people's thoughts and opinions on the subject. I'm a bit undecided from what I have read. Many people seem to write it off but that said there are also posts detailing positive experience and research. http://www.aapsa.com.au/fuelstar_reports.html http://www.4x4web.com.au/skips4x4/my4wds/hilux/fuelstar.htm http://www.immortality.co.nz/fuelstar.html I'm not so concerned at the fuel savings... They would be a welcome outcome but I am more interested in the effects on my engine. Would they be different to or more beneficial than valve a saver additive? My interest was sparked when I saw the product in a store for $100. Thanks everyone! Phill.