Do you mean Rotella T 5W-40?
You can get this oil at Wally World. More than a few folks have had reduced consumption with this oil.
Oil consumption can be a difficult thing to pinpoint. I once switched brands/weights and ate over 2 quarts in the first 1,500 miles, in a motor that was not using any Mobil 1 10W-30! Go figure.
Don't judge an oil based on just one drain/fill cycle. Often takes two or more to get a good baseline. The oil mentioned above settled down after the inital drink.
It is difficult to find a "poor" SL or SM oil these days. Some engines just prefer one or another. You may wear out your engine searching, but it'll be clean from all the oil changes!!