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The Smarty Jr seems to be the hot item for the Cummins at this time. They have fewer problems than the Edge products which have been outsourced to some Asian country.
I had an Edge EZ on my 5.9 and it was set on the middle setting. I didn't notice any change in mpg but the extra power was really nice.
If you are only interested in better mileage you will probably wait for many years to just break even as far as cost goes.
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