After reading a recent thread asking if the Powermaster underfilling of cans issue was resolved, I got curious. I had a new bottle of Omega and an unopened can of Powermaster. I marked the level on the Omega jug and emptied it, then re-filled it with the new can of Powermaster. Either Omega is giving more than a gallon, or Powermaster is still coming up short. There is a possibility this can of Powermaster was old stock that somehow was only put out for sale last winter.