I'm not sure I can help much as we just use Months (-12,0) on our reports to show graphs that run 13 Months (as Apptio doesn't count the month you are in, you just need to select 12 previous months).
If this is what you want but just didn't know how to do it, add Months (Yr) from the time perspective to the Axis box. Then right click and choose Range, then put 12 in the Past Range box that pops up and 0 in the Future Range box, hit OK and you should be good to go.
It's a pain to do every time you want a 13 month view, but I'm not sure there is a way to have this as the default.