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It is measurable and does make a difference according to one of the designers of the C5, Evil Twin. This non-traditional method for checking the oil would not be mentioned in the owner's manual if it made no difference. An LSx engine is not the same as every other engine you've had in your cars.
I have. It makes a difference and the reason is in the design of the LSx engine. The design engineers would not have gone through the trouble of making sure this information was included in the owner's manual otherwise.
Then I'd really like to hear the justification from him.
I know where 6.5q registers on my dipstick when added to a cold, dry LS1 engine, and that's really all I've ever used as a reference point for 97k miles.