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If you want mileage get an lb7 duramax 04 and down. Keep the fuel filters changed , tune with Efi live from a respectable tuner like Danville performance, duramax tuner, Idaho rob, etc... Tell the tuner exactly what you want and go from there.
Edge juice with attitude will get you some mileage as well, but once an Efi live time is on there you will be more than satisfied.
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