Jingles, I'm curious too! I've never had a coil last like this one did. Could it be an isolated incident? Guess we won't know til the next one.
I did keep the same flavor in it (NiteLiteVapor Line Rider 65/35 PG/VG) and it's a light color vliquid. Nope, I sure did not clean the coil.
I don't know if this would serve anyone but I kept a record of my fills.
Line Rider in nautilus Mini
8/2 Fill 1.
8/3 Fill 2.
8/14 Fill 3.
8/18 Fill 4.
8/25 Fill 5.
8/27 Fill 6.
8/29 Fill 7.
8/30 Fill 8.
8/31 Fill 9.
9/1 Fill 10.
9/4 Fill 11.
9/6 Fill 12.
9/9 tossed coil.
What interests me about this data is that I was not refilling the tank too much initially. I wasn't sure I liked the vape on the BVC coil, but as time went on, it was as if the coil broke in and just kept getting better and better.
Hope that answers all your questions, Jingles. If not, I'm happy to help where I can.