looking at the stock tune on a 07 z06 in power enrichment lambda goes as low as 0.75 and levels out to 0.78 on top. checking with the wideband, the engine does exactly that. why does the ls7 need so much fuel? this is deep into fi territory, i run around 0.77 @ 1 bar on the ls1. how much can this be leaned out and still be "safe"? i would like to do 12.6, but im scared, its 10% less fuel.