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UTL is just one part of your score and overall effect will vary from person to person. There is a thread showcasing how one person's score changed as their utility went from 89%(?) to <10%, but again, YMMV.
Personally, my score went from 716 to 725 after I lowered my overall UTL from 27.2% to 19.6%.
Locked thread to direct others here:
http://ficoforums.myfico.com/t5/Rebuilding-Your-Credit/util/m-p/1008058