Just thought all nitrous guys should know, I used to, I repeat used to have my nitrous bottles filled at Speedtek Performance in Haltom City, Texas. I had 4 bottles filled there and they all showed right at 25lbs each when I got them home. I made 2 passes with each bottle at San Angelo. I got to the finals and at 3/4 track the motor slowed which made me lose. I weighed the bottle with the same scale and it showed 20 lbs. I turned the valve on and only air came out. I then checked a second bottle with 20 lbs. and only air came out of it. Cost me $700.00. The difference between 1st and 2nd. Buyers beware. If anyone is interested I now have nitrous pump and filling station and am south of Granbury.