Just got 1.5 Gallons through my N21R Limited 3 Port. This little Engine is awesome! Still has a bunch of metal to metal pinch. Timed a few tanks today, Ran out at 10:21, 10:25, 10:30. I'm using the 6.5 Restrictor, 9886 Pipe w/ Ofna ] Header, and a Novarossi Exhaust Cooler. Everyone at my local track is very suprised by the amout of power it puts out. Runs at 230 all day long. Could'nt be happier with a $140 Engine!