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My suggestion for better mileage is, buy a honda(or other ricer) and don't drive your truck as much. sorry I'm no help but these things are pigs, I drive the honda to work and school and drive the blazer on weekends, I really don't think that tornados or other devices would really work. If they worked that well we would see them on every new car produced. just my 2 cents
red72
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1972 K5 Blazer with Cummins 4BT, NV4500 swap in the parts gathering stage.
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