For me it's manual. I've driven a range of M/T and A/T and it's true that you save more fuel using manual transmission. I've experimented on both transmission(Even the latest A/T models) and still M/T is still the winner in terms of fuel consumption(less consumed fuel). But with today's technology I think A/T is not far in gaining the advantage against the M/T. In terms of speed control, no doubt the M/T. That's just my 2 cents on this matter.