The problem of mixing or blending in a tank of two or more liquids of low viscosity and the same density has been investigated in terms of available information on turbulent fluid jets discharging into a very large volume. Under the assumption that all fluid inducted into the jet is mixed completely, the effectiveness of any arrangement has been expressed in terms of a performance parameter which is defined as the gallons per minute of fluid inducted per horsepower supplied. The calculated results for a large gasoline-blending tank demonstrate the superiority of performance of the propeller-type mixer over typical jets produced with transfer-pump and pipe-line equipment. The economics of the installation and operation of equipment were not included.