I am running a NR limited 3 port with a 6 mmm venturi..I`m getting 12 minute run times(med- small track) and over 10 minutes on a very large track with just over a gallon on the engine..Engine is running slightly fat still..Its also starting to get cold here which will hurt run times to..I really interested in seeing how much run time I will be able to get when the out side temp get warm and I can lean it out a little more..I`m also not lacking anything in the power deparment as well