but you neglect to take into account the "I enjoy doing that as a way to spend my time" hobby aspect, which is a soft cost that's difficult if impossible to measure.
I may not think so, but plenty of people would. After all, if nothing bad has happened, nothing bad will happen, right?
The depth of sand surrounding their heads is astounding.
That's good to know. My son, who isn't interested in any of this, goes by the monitor on his 2016 C-Max Energi. Now, when he was in school, a bunch of his miles were on battery--and I had to force him to change the oil after (I believe) more than a year, because the monitor hadn't said boo...
'Twould be fascinating to see this test done with conventional oils and 5000 mile intervals.
I'm just saying.
And then there's the difference between the test stand and the real world environments--for example, pulling a loaded vehicle through the mountains during a 90+ degree summer.