I use gapless rings to my advantage. Because they leak so little, they allow me to use a sealed pcv system to draw a vacuum in the crankcase, which in-turn allows me to get away with 12lb oil rings to pick up a little power/mileage. My setup draws 15"Hg crankcase down the hiway, without help from a vacuum pump. I do have an electric pump for backup when I spray, but it's not needed even for the occasional WOT NA blast on a backroad.
Don't you know...gapless top rings don't deal. They are all oil burners. That means they are junk.
Now that we dispensed with that, I've use probably a hundred sets of gapless top rings. In everything from street cars, to street/strip junk, bracket engines and some heads up stuff.
Not one of them has ever had a oil using issue. Not one. The shop I was at when we tested them still uses them. Every day. He still has had an oil user come back.
