this might help you with the starlet gear ratio's it has a listing for all TRD gear sets sold for their close ratio boxes
http://trdparts.jp/english/list_race-mis_ep.html
if you run 13's the difference in wheel size is negligable between the starlet and the mini
I think it works out that the mini's 5-10% slower in speed vs revs
Note the graphs are on a 3.722 final I think. 4.7 available through trd but i'm sure their are others.
apparently you can use any toyota e series motor gearbox on the 4EFTE i.e. the 4age motor has a slightly lower ratio when bolted up as they rev higher, their's lots of options apparently, guys with starlets on high boost are having problems with traction in nearly all gears on short ratio boxes though, a high gear keeps the boost away when you don't need it
