The Hat, thanks for confirming that the idea of draining bigger cartridges actually works for Canon; there is definitely the wish of some to stay with OEM inks but trying to find a tricky way to save some money, some may want to utilize the good UV performance of OEM ink with a printer which does not take the more cost effective cartridges, and some other just don't care and refill with the cheapest ink available. Whether they all save at the end.....o.k., that's another thread..
When it comes to fading, I did some tests, partially reported already before, I tested a
'UV resistant' ink from US/Amazon, that actually was a fast fade ink, useless in this respect.
I tested an ink from China/Alibaba 'UV resistant', CMY perform somewhat better than Coralgraph dye inks, except black, that has turned into a yellowish brown after 3 weeks, by far the best performing dye inks , non Epson OEM, are inks out of cartridges for the Fujifilm Drylab printers DL100 etc, virtually no change yet in 3 weeks out in varying springtime whether, sun, storm, humidity, but no direct rain. Those inks are definitely a magnitude different to all the other inks tested, and run at about 25% of original Epson inks (in small cartridges). In a way they are OEM inks as well, but by Fujifilm.
Epson does not offer at all dye inks in larger cartridges for their large format printers.