[Ryephile]

The long crank times has nothing to do with DI or push-button in general, otherwise every other DI and push button on the market would have the same "issue".

My hunch is it's priming the oil system prior to actually going into the crank fueling state. The crank times appear to be coolant and/or oil temp related. A warm LT1/LT4 engine fires much quicker than a cold one, and that's all in the calibration.

Until I do a datalog to prove or disprove this theory. You can rest assured however it's not a rule of thumb issue for DI or push button. This is a very intentional calibration by GM.