If you are looking for max fuel economy set it to Level 1. One of my customers is getting 19MPG hand calculated on long drives in Florida at Level 1. I pair this or the Agile tuner and sell with the IO Pedal tuner. I see a huge difference when paired with our Kooks Exhaust system given it has less back flow. If you are interested in the IO Pedal tuner, I have those too and sold 3 this week. 704-682-9323 Thanks, David I do have to finish editing more videos of this as well for our YouTube channel.