Put 102 oz (8/10th of a gallon) of fresh pure gas in an previously empty gas container. then add 26 oz of your pre-mix gas/oil mixture (which currently is at a 10:1 ratio and thus contains 2.6 oz of oil) from your other container.
Then you will have 128 oz of gas/oil mixture in your new container that by ratio has 2.6 oz of oil. That is now a 50:1 ratio.
Jim
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