I've been using a 2018 1.5TSI eco Octavia 3 from new to its current 37000 miles and it has used a litre every 4500 miles or so consistently. It's the only car I have owned or used that has done this. My previous Skoda's (1.9 TDi PD, 2.0 TDI PD, and 2 CR 2.0 TDI's), have used a litre max every 10K miles, if that. Even my near 15 year old Toyota 2.2 D4D engined Corolla only uses 0.2-0.3 litres max every 10K miles. Like said already, the 0-20W oil is very thin. The only positive is that if you get caught out at least the add oil warning is before it reaches minimum. Shame it doesn't have a oil level display on the dash like some French stuff does on start up.
It's also the only car I have ever owned that has almost zero engine braking effect on the motorway when I let off the accelerator. I guess that's low friction for efficiency.