Nice, well you obviously read some misinformation or interpreted it wrong. I usually just drain and refill. Pull the plug and get about 2.5L. Jack up the back of the car and get another 1/2L.
I can't remember how much you get by dropping the pan and filter(screen/strainer). If you wanna get even more out pull the valve body out(I wouldn't bother). Not much comes out when you pull the cartridge filter(like I mentioned already).
View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)