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I went from 14.6 mpg to 22.3 mpg on my 7.3 diesel (52% increase in fuel mileage).
All I did was changed the way I drive. I can do a 11% change just by adjusting my right foot. I'm not an HHO doubter, but unless this system can honestly double fuel mpg without causing engine damage and costing $1000 or more, I'm happy doing what I am doing.
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