Very nice writeup, thanks!
I wish the Prius would have an oil change monitor / indicator. For an otherwise very green car, having fossil oil and fixed change intervals (of only 5,000 miles at that!!!) is positively stone-age, and not at all environmentally friendly. My old Subaru without any fancies had a 7.5k change interval, and my MINI Cooper S with monitoring went 12k for the first and then 15-18k miles for successive changes on synthetic oil. Over the life of a car, that is a very significant difference in oil consumption.
Toyota, can you please change this?
Kudos to Honda for being on top of this!
And of course, congrats Chukbug on your fantastic car!