I think most of you are looking aside of the actual trickery of the Hiclone, see the Hiclone actually does work, but it only makes an improvement on vehicles that have restrictive air flows, paper air filters OR a vehicle that has a fault in the computer or similar. You could say the Hiclone can be used as a "Patch" for the problem, but its not worth the money. Hiclones also lose their effect in Computer controlled engines as the sensors pickup and adjust to the change. So end result being, its an obsolete product, especially if you have a car that has a high flow air filter or basically is setup for performance. I think that is why they try to sell high flow air filters and magnetic fuel devices with the hiclone, so you don't actually realise how useless the hiclone is by itself. Same with their claim of it creating cleaner combustion, fuel injected motors run extremely clean these days even over 100,000kms they are still clean inside, provided there are no faults.
And if anyone says that car manufacturers spend endless time and dollars into getting the best performance out of their cars, BS!!! if that was the case, they would not put restrictive exhaust systems on the car and restrictive paper air filters in the cars. See they like to get the best out of a car, but with cheap parts!
Don't get me wrong I drive a Holden and like them a lot, but I have to turn a blind eye on all their BS, and it spreads to all corners of everything they do and sell, right down to charging nearly $10 for a tiny bulb or a storage compartment catch, which holds the flap up $13 for a tiny piece of plastic that has virtually nothing in it. I went to holden to buy a replacement, when he heard what I was after, he goes: Yeah, sell hundreds of em. I bet they do, and I bet they made it to last! Well anyhow I pulled the thing apart myself and fixed it.
When it comes to the magnetised fuel devices, I haven't researched this extensively yet, but It would make sense for it to work, though don't take my word on this one, even if the figures aren't quite so high as they claim. Fuel does go off or get stale, which is why you never leave a car sitting for too long. I'd say it would make more of a difference in your car if you don't go through a tank of fuel every week. Though you have to consider, does anyone actually test the quality/age of petrol from the pump? I doubt it, and it would only be beneficial for fuel companies to serve out stale fuel so you come back all the quicker, and you know what those companies do to stay in business. Basically if you think any company is doing the right thing by you, your just a silly sheep in this money run world.