When in eight-cylinder, non-boosted mode, you save fuel, still probably have 425+ HP. When its on, you get the full gorilla. Good question you raised as to whether this will be tied to the DMS (other than ECO mode when it will be). GM will sort this out over the next ten months of testing. I do long country trips, and perhaps not only will these features allow us to avoid paying $2K or so gas guzzler tax at purchase, but probably get 27-30 MPG when cruising on the interstates. I do like this statement in the press release: "These technologies – combined with the fuel-efficient multi-speed transmissions, aerodynamic design and lightweight construction – help make the new Z06 surprisingly fuel-efficient." Got 29 MPG on my C6 Z06 on my last round trip from Oregon to BG, and that included some adventures to the right side of 100 MPH. Thinking I will be able to do the same in the C7 Z06.