Score changes for util result from changing from one % range to another. So, under 10%, under 30%, under 50%, etc. There might be ranges for under 5% and under 20%. It's hard to tell for sure, because most of us have so many things happening on our reports that it's difficult to isolate individual causes of score change.
So there likely wouldn't be a change for moving from 3.5% to under 1%, but it IS fun to torture the CCC's this way!
And as the others said, installment loan util is calculated separately from revolving. Most of us here obsess about revolving util, as it carries more weight in scoring.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007