Don't know anything about those cyclone deals, but someone did point out that it could make things worse by introducing turbulence. Fluids (liquids and gases) have laminar and turbulent flow depending on several factors. Fluid velocity is in the numerator, so higher fluid velocity could push the Reynolds number into the turbulent flow range. Cross sectional area is also important, and a smaller area increases the Reynolds number. Fluid viscosity is also important, but the other two factors would seem to have more of an effect. Gases have low viscosity, whereas liquids are obviously higher.
http://en.wikipedia.org/wiki/Reynolds_number
As far as a magnet, I can't imagine how a weak magnet could affect a non-polar, non-magnetic substance like gasoline. I think the makers claim it "aligns" the molecules or something, maybe even claims it "ionizes" the gas. I'm a physician and we use MRI a lot. Now that's a very powerful magnet (probably thousands or millions of times stronger than the magnet in these fuel saving things), and the magnet definitely affects water by affecting the hydrogen proton. A weak radio signal is given off when the protons "relax" and the computer converts this to a picture. But we're talkin' a very strong magnet.
Anybody who's had an MRI will tell you they're not fast. Even for a knee or shoulder, it probably takes about 45 minutes of laying very still in that strong magnetic field. I can't imagine a little bitty magnet doing anything to gasoline as it flows by for a few seconds. I saw one claim that said it "changed the molecular structure" of gasoline with a magnet. Gas is a mixture of hydrocarbons, but if you change the molecular structure of something, say H20, then it's not H20 anymore. You can have the same chemical formula, but different structures. That's an isomer. But gas is formulated to contain a certain mixture of hydrocarbons, so if the structure changed to an isomer, the mixture is different and wouldn't perform as gasoline. It would still burn, because it's a flammable hydrocarbon, but it might be akin to trying to run a gasoline engine on diesel fuel. So they're saying, "it's not gas anymore" because its structure changed? Doesn't even make sense.
I'd say bunk on both.
Aftermarket intakes help with power because, if it's a cold air intake, it's taking cooler, denser air. And air is the limiting factor. A gallon of gas takes many, many cubic feet of air to combust completely, so air is the limiting factor. If you can make the path bigger, straighter, smoother and with less resistance, you're helping get more air to the engine. Cool gases are more dense, so for the same volume (a cubic foot of "hot" air versus a cubic foot of "cool" air, the cooler air is denser (more of it in the same volume) and there's more oxygen. Air is only 21% oxygen and not very dense, so you've got to move a lot of it for the same amount of gas. Superchargers and turbochargers compress the mixture for even more bang. Ever wonder why top fuel dragsters and funny cars burn nitromethane? Those engines gulp huge amounts of air, but it's still the limiting factor. So what to do? Use nitromethane, which has its own O's built right in. Doesn't take as much air (although still a crap-load), but now air is less of a limiting factor and you can burn several times the amount of nitormethane compared to gasoline. Here's a better explanation off the 'net:
Nitromethane is used as a fuel in racing, particularly drag racing, to provide more power.[2] In this context, it is commonly referred to as "nitro" or just "fuel".
The oxygen content of nitromethane enables it to burn with much less atmospheric oxygen in comparison to hydrocarbons such as gasoline:
4CH3NO2 + 3O2 → 4CO2 + 6H2O + 2N2
14.6 kg of air are required to burn one kg of gasoline, but only 1.7 kg of air for one kg of nitromethane. Since an engine
You didn't buy a V8 4Runner for gas mileage purposes. If gas mileage was your biggest concern you would have bought a yaris..... Anyway The best way to get better gas mileage is to let the engine breath better (i.e. cold air intake and bigger exhaust which are probably only going to yield minimum results in which case you would have saved more money on not buying them and just driving slower and making sure your tires are inflated properly.
