Yeah you said about a quart in 50 miles...that's a bit too much I guess. I think if it can hold a quart for at least 300-400 miles that's not too bad for high mileage, but since you are building this engine up, new rings etc, I'd expect better once its broken in. Strangely, my truck has had less appetite for oil since I installed the turbo, it may have something to do with the relocation of the CDR valve, who knows, but at 192,000 miles I'm using about 2 quarts between 2500-3500 mile oil change intervals. fair to good as far as I'm concerned. Good luck and keep us posted.