How does it help fuel economy? Additional light load timing advance?
I used HPtuners on my old '04 GTO and it had a "dormant" australian strategy for lean cruise mode. I was able to populate the tables and make the lean cruise active. That worked nicely. Aside from that, the only way to get any fuel economy was timing advance, which the LS1 did not like much. An additional 2 or 4 degrees at light load would make it ping even with 93 octane.