Ok I just realized when working on Autumn Leaves intro measure 5 that I have been fingering the C13 differently than Marc in all of my etudes. I have been using 1x123x (with a half bar) instead of 1x234x. (I just shifted the 3rd finger down to flat the 13th.) It seems like an easier fingering to me. Should I use the fingering shown or what works for me? Thanks!