There is 128 oz in a gallon. 128 divided by 20 is 6.4, so 6.4 oz of oil to a gallon of gas for 20 to 1
Every 40 ounces of gasoline add 1 ounce of oil for a 40 to 1 mix. You do the math.
There is 128 oz in a liquid gallon so to achieve a 40 to 1 ratio you would add approximately 3.2 oz of 2 cycle oil to one gallon of gasoline.
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Look on the Gas cap of your weedeater. It should tell you the gas to oil ratio. If its not there try looking in the manual or online.
It depends on the brand and concentration of the powder mix. I would add it to taste.
6 ounces
1 US gallon = 128 fluid ounces. in a 100 to 1 ratio you would need to add 1.28 fluid ounces.
Assuming you wanted to preserve the ratio of product-to-water, we solve this by setting up and solving the equation: 1/50000 = x/250 From this, just multiply both sides by 250, yielding x = 250/50000 = 1/200. So you would add 1/200 = 0.005 gallons of product to 250 gallons of water.
I would add only 1/4 of a gallon if the level is 0. Then check the level and add a little if needed.
Because of an extensive tax on gas, gas stations don't make much more than two or three cents per gallon of gas sold. Over time, that may add up to a lot of money for gas stations, but for a single gallon, the gas stations aren't making much.
1/2 gallon the formula is 2:1
None until you add it.