i also had the same question like you..but finally i ended up with honda fit gp 5 as my first honda car(early im a toyota lover)
i have to say this to u..if u compare aqua with honda fit gp 5 ..fit is the best option(u cant compare with gp 1,because gp5 technology is better than early gp1 model)
when we talk about fuel consumption my fit is doing 25 -28 kmpl in outstation..i think aqua is also doing the same or may be 1 or 2 km s more than this..