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No two engines/vehicle platforms will respond the same. Case in point, the l86 in the trucks (6.2) is the same engine as the LT1 other than the intake manifold, so instead of 455/460hp we have 420hp. Where the Camaro SS only sees around 10rwhp with the RF CAI the trucks are seeing over 20rwhp gains with a similar CAI kit due to how restrictive the OEM airbox is.
With that, the OEM calibration on the timing side is almost at max performance, there is not much to be gained from tweaking it any. GM has really done their job over the years on getting the timing maps perfected.
All manufactures run rich, as said it is done for safety as they have to buld a car that will drive on -20° to 120° and from below sea level to 6000' above sea level on anything from 87 octane to 93 octane.
If GM knew all owners would do right in their vehicles, the tunes would leave less on the table but they know there are too many owners who don't take care of the vehicles so they have to build a vehicle for the masses.
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