I've always tracked tax efficiency of all my holdings using Morningstar "Tax Analysis", see below. I've filled tax deferred accounts with our highest tax ratio funds, and the rest with lower tax ratios go into taxable. I am sure there are other sources, but M* has provided stats for years, so I use theirs. Best of luck...
No one agrees with other people's opinions; they merely agree with their own opinions -- expressed by somebody else. Sydney Tremayne
Retired Jun 2011 at age 57
Target AA: 60% equity funds / 35% bond funds / 5% cash
Target WR: Approx 2.5% Approx 20% SI (secure income, SS only)