Don't think this has been linked to before : a nice summary of the various alleged performance / economy enhancing devices that we discuss occasionally here :- homepage.ntlworld.com/cains1/Fuel_saving.htm
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A pity he doesn't understand the difference between turbulence and swirl but the rest of what he says makes very good sense.
The sad thing is that there will always be gullibles who ignore the warnings and believe the hype.
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