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There are only two ways for them to catch fire that I know of, well recalled reasons anyway. One's the transmission, the other the grid heater solenoid. The latter is easy enough to circumvent.

I think a '21 has the old (better) CP3 pump, but don't take my word for it.

I really can't recommend one over another, not really having used much of any of them. The Howes I use for anti-gel has a summer version, too, and Stanadyne is Cummins approved as I recall. Optilube placed very well in the tests I've seen, but those are old. Straying from the established...

Yeah, although I was thinking more along the lines of trucking, ships, trains, and such. The stuff that keeps the world moving. And I do feel sorry for those who use heating oil, diesel, etc. for heating. That's not an indirect hit.

Ah, sounds like you're going by the Lie-O-Meter, not calculating actual mileage. That makes it a bit tricky to know what's really going on, as it shows the mpg over the past 200 miles or so, and not necessarily accurately.