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Does anyone have one, does it do what they say, 12% gain. I'm getting 20 mpg now, like to try one?????:popcorn:
 

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I have read nothing but good things about the MMM, the MMM tune is supposed to be coming out for the XZT+ in place of the current econ tune it has if I recall correctly.. Contact James @ Rollin Smoke Diesel he can set you up with a XZT+ and run it on econ mode.. also the high idle may come in handy
 
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