I was told that 4 oz of oil was a 32 to 1 mixture. The oil I have been using is 2 and 1/2 oz and says it is 50 to 1. I don't understand the numbers of the mixture. Is the first number the oil or the gas? Is 50 to 1 more oil per gallon or less? Why is 2 and 1/2 oz 50 to 1 when 4 oz is 32 to 1?