still a stretch to say a csv4.4 is better/equal to a sub with ~25gal drawdown tank in the home as far as cycling. seriously, how many people actually have a toilet with less than 1 gallon flush? how does 20-30 cycles from flushing outweigh 3-4 cycles per 2-3 people from showering? ..and anyone taking this kind of shower is having way too much fun in there.
with csv, i think that little initial price difference in tanks from 4.4 to 20 is a small price to not worry about your pump running with every little bit of demand.. those cycles add up.