Think about it. If any manufacturer could get 10% fuel efficiency savings from a $1 piece of tin, every car manufactured today would have such a device.
They spend millions of dollars getting 1% improvement, so if it worked, all the manufacturers would have their own version fitted as standard.
Keep your money in your pocket I reckon.
Should I mention Peter Brock and Crystals on this thread....



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With attached string you don't even have to open the door to rescue it.

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