Well, almost a full gallon through my extech .21 now, and I must say I am very pleased, break in was easy, no problems or flameouts or anything, very nice. First full race day this past saturday, ran strong all day, you can tell on the back straight that my mill still has a very strong pinch, not quite fully open yet. Ran P4 plug, 6.5 restrictor, and Big Boy pipe, and of course 30% Platinum. She started getting with it in the main and I was very happy with the powerband.