I dont understand.
We have all striven and strived for low-tension rings.
They are low tension under coast (not compression stroke) But under compression, they seal up tight.
I have seen this using my leak-down machinery. Less then 2% leak down in the Harley with about 12 lbs of tension and it uses no oil.
Yes, it is dry sump and perhaps helps?
I think the crap oil is the culprit to get the 1 % more mileage in these cars.
Reading various oil charts , there is no reason for the Ow20 stuff under normal operating temps .
(Unless one is living in a really cold climate)
https://drivenracingoil.com/c-1389539-shop-by-viscosity.html
Our Supra comes with the recommended 0W20 crap
It got dumped and replaced with 5W 30 at the 7K mark and I think that was way too late! But I was not at all sure if they had a break in oil in there somewhere too?
If it is low tension rings fault, then the oil is being consumed in the exhaust and intake stroke?
As of right now I cant understand that.