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I have a 2004 6spd cummins 4x4 and want to get the best MPG possible. Do you guys have any ideas. I have Edge and Diablo and only get bout 19mpg's. I heard bout The "Smarty" but wanted all you guys opinion. I have an '06 2wd cummins too and have a diablo and get 25. What is there out there for my older cummins?
Thanks guys
 

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I am getting around 22-23 mpg with the smarty revo TNT
 
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