I made 4 nitrous passes at Elsinore. Changed bottle after every pass. I finally got around to weighing by bottles and it seems that I used 5 lbs. on every pass. Is that possibe on a 10 second run? They are 10 lb. bottles. 24 lbs. full & they weigh 19 now. Oh yeah, It's a 250 shot. I'm gonna hafta have the old lady follow me up & down the river in the pontoon boat with extra bottles.