Then I would gather the next question to ask is which day of the week is the best / worst to have our Volt get born??
Maybe that doesn't apply like it used to. I just remember hearing you never wanted a car on Monday due to hangovers or Friday due to thinking about getting drunk in a few hours. But that was the '70s rumors (or true back then!).
I don't think the old manufacturing day of the week logic works anymore as most of the assembly (preassembly) is done in modules, i.e. the dashboard, engine, or the battery pack. Thus, day of manufacture for the car doesn't apply to these subassemblies. Most assembly is now done by 'sober' robots.
Here's a flashback for us crusty old folks:
I remember in the 70's my girlfriend's (tiny and inexpensive) 1970 Toyota Corolla (manual transmission) went well over 100,000 miles without a lot of maintenance and still nothing broke. Other than an occasional oil and filter change, her car didn't need plugs, plug wires, points, condensers, caps, rotors, water pumps, clutches, alternators, u-joints, fluids, fuses, etc. It always started and ran so why fix it? This was a learning experience for us suffering GM, Ford, and Chrysler owners that you are referring to in your statement above. Japanese competition started a car QC revolution. Now the electric car is the next revolution.