1: No, you can move in anyway you want, as long as you stay out of difficult terrain(Same page as turbo-boost, you may make a move of up to 24").
2: No, you do not lose it (bike page, says +1T, vs. non-instant death, nothing more).
3: He can turn however he wants, but if he moves more than 12" he's moving flat-out, and can't disemark/load troops. (Fast vehicle page says so.

)