| 08 LMM MPG improvement
I have a S&B intake system ordered and need to know what I should do next. I assume a tuner would be next and later an exhaust upgrade cause I don't have loads of cash. I read about a system called "Duramileage" which is basically reprogramming the stock ECM to increase mileage up to 20%. Does anyone know about this? I can't believe all the info out here as I'm new to diesels. I tow a 13,000# 5th wheel and am primarily interested in mileage gain. Thanks | 
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