Well I went and put a few tanks of fuel through it and I ended up leaning it total about 3 hours and it is much better. Bette runtime ans the JP-3 makes the power smoother all the way through, the Jp-1 was all off the line and died 3/4 of the way through. The mill is a SH 6port .28 And I sent it to a local guy, for my 1st race nitro mill it is just fine. I am getting a buggy at the end of the summer and I am going for my 1st high end mill and it will definetly be a .21. I wanted a truggy 1st as I was told to learn driving nitro on a truggy would be easier, I also race 10th scale electric and do very well with that.