did a VERY objective test (over 3000km) with and then repeated the same trip without hyclones. same load, similar weather, same route. all in my '04 cruiser 4.2TD and I got EXACTLY the same fuel figures for both trips.
Now I dont doubt that some vehicles have some improvement from them (reasonable knowledge of aerody) however I this you will see the most improvement in older style vehicles where the air system is less even on the inside. Newer vehicles with moulded plastic air piping would have no real benefit from the air 'spinning' or passing through at a higher speed (due to the spinning)...
cheers!
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