2013 ZL1 Manual Trans
This car was baselined with less than 100 miles, but we were still puzzled as to why the numbers seemed low for a manual trans. We found that the dealership filled it with 87 octane fuel. When finished, we tuned it for 91 octane, because it was shipping to CA.
Did you re-dyno the car when it was stock with 91 octane? I just picked up a '13 ZL1 M6 that still has the dealer filled gas. Curious to know how much this affects the numbers. Good news I have a BP that sells 93 octane in my area.