Puzzled ! Math Minded

[abl1111]

Does my calculation make sense ?

Add 2 gallons of fresh gas to a 1/2 gallon of the heavily concentrated/oiled gas to get me pretty darn close ? Gets you to about 2.56 (50:1 is 2.6)

How do you come by your answers ?

I did:

2.5 gal : 32oz of oil is equal to 1 gallon of gas : 12.8 oz of oil

My theory -- If I added (4) gallons of clean gas to the (1) gallon with 12.8 - for a total of (5) gallons ( less the 12.8 oz which I didn't worry about ), then it would be about 2.56 of oil for the (5) gallons overall. Sound about right ?