Your experience with the MP8 is why I nixed the idea of stacking the MP8 with the Edge. Around 15 MPG is right where you should be stock from my experience. I gained 1 mpg when I added the Edge Juice and then another 1 MPG when I added my Volant and I gained another .5 after I cleaned the oxygen sensors a couple of weeks ago. You might want to think about cleaning your oxygen sensors, at least the one in front of the DPF. If your DPF was at 90% full I bet it's pretty sooted up too.
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