Coljac, the Cyclone fuel saver is "possibly" only of minor brnefit to non turbo cars, it is of no use whatsoever to cars fitted with Turbo's.
I say "possibly" as all it is , is a non powered fan which fits in the air intake to manifold pipe and spins as the air passs through it, and will only spin as fast as that air, whereas a turbo , being powered, forces more air into the chamber.
There is no validated data about fuel savings with this item fitted, and for the