Not to knock anyone. But efi live is way smoother, no rattle. But I didn't switch to efi live for mileage. I built the trans put a lift pump on and wanted more power. Went to efi live and wow huge difference, but now again I'm wanting more and Now I'm puttin twins on, dual fuelers and eventually building motor. That being said I really don't have any tunes for mileage, which can be done by any of the tuners, but for what I have now and my driving style, my truck got way better on the predator setting 120 then I do now.