Any one see the new MPG MAX system from snow. It's designed to run small amounts through small injector at cruising speeds. Gains a couple of mpg and regens less often. A second larger injector kicks in for putting you foot in it.
It is such a new product that I don't have any first hand feed back yet. Part of the extra cost comes from a larger reservoir-7gal vs 3qt and a more advanced controller that also displays boost and egt's. It is also designed to be used across the entire power curve.
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