The Sullivan 1/2A tubing is the best I've ever found. I don't think you will ever run a .074 into fuel starvation at WOT with this stuff. The muffler pressure tap will see to that. The fuel in the line has weight and that weight is influenced by G forces, so stay with the smallest tubing that will get the job done if you plan on flying the plane with reckless abandon. Same theory applies even if you just want to fly like a timid Nun.
