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I have been using/trying the Wal Mart product just to boost the cetane numbers. Are we getting better fuel mileage? Can't say as we are using the Spartan Tunes with dpf delete and have been getting excellent results both towing and empty (average of 20% increase in fuel economy). As far as lubricity diesel is a superior lubricant so it's very difficult to obtain verification that additives increase lubrication in the top end of a diesel engine.
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