i was having an impression that ALTO/CULTUS/SWIFT are having almost SAME fuel consumption.
as many claimed 20/21 for cultus and heard some claims abt swift as well.
and it is plausible considering the power to weight ration, i.e. the bigger engine to compensate for increase in body weight keeping the engine efficiency constant.
but i think alto is leading w.r.t. to fuel in the current suzuki line up with quite a bit of margin.
i will take alto as: getting best fuel milage with least amount of investment and offcourse as 2nd or 3rd car.