If I was to Mix 2-Cycle weedeater fluid with 1 pint of gas how much do I use?

Depends on the required RATIO, Your manual should tell you the Ratio and use a calculator to determine the quantities. ex: 20:1 is 20 oz gas to 1 oz oil, or 8/10 oz oil for 1 pint gas. for 32:1 mix 1/2 oz oil with 1 pint gas. for 50:1 mix 1/3 oz of oil 1 pint gas. see: http://www.csgnetwork.com/oilfuelcalc.html 8 pints = 1 gallon so use .125 for the gallons of gas