For all the knuckleheads that keep bumping their chest and "SCREAM" that this was a waste - watch the video below (thanks
@Owen Lucas for making it). OP's 20 mile "rinse" with oil DID in fact clean stuff up. Or more like collected what usually stays behind during an oil change. And no, shortening the OCI by 1000 miles would not achieve same results. I would even go as far as saying that this type of short rinse is safer (and just as effective) when compared to using actual motor flushes for 5-10 mins during normal OCIs.