1 ml = 0.033814 US ounce
1 ml = 0.035195 UK ounce
3637ml
8.1 fluid ounces = about 240 mL (fluid ounces x 29.6 = mL).
one US fluid ounce = 29.5735 mL. Multiply 2.5oz by 29.5735 for your answer in mLs.
4 Fluid oz UK =113.65 Millitres