I was the person who brought up the number originally as a way to illustrate that the he median _LONG_ distance trip is that distance. Those trips accounts for less than 1% of all travel by personal vehicle. Maybe it was unclear.
You are entirely correct in noting that the mileage for the average daily/normal trip is about 15 miles: https://www.bts.gov/statistical-products/surveys/national-ho...
Ah, yep, that's on me for missing that context. Neat to know I was pretty close on my gut estimates there. Thanks for sharing that link.