Actually Bike fuel consumption is depending on many other things then fuel atomization. most sportbikes have lot of overlap in valve timing at low revolutions, so fuel is wasted to the exhaust directly. also overlap causes the bike to have low dynamic compression ratio at low engine speeds. Also big intake ports made for high revolutions and high power and too big for good flow at slow engine speeds. this causes bad fuel atomization no matter what the injectors are. But of course injectors have something to do with it too.
Also bikes like speed triple have high wind resistance.
If Speed triple engine would be tuned(cam timing) to run maximum of 6500rpm(like a car), geared so that if would rev under 3000 rpm at 60mph and intake tracks would be made smaller so it would just be enough for that 6500rpm filling, probably making like 60hp. I think it would be pretty fuel efficient then.
I had TL1000, which has insane injectors. I think the fuel consumption was very good. it was always lower then 6.5litres/100km. cruising at 120km/h it went even 5.5 if the speed was constant touring.
My 954rr used 6.5litres/100km stock. then I bought powercommander and used it with stock pipe. it lowered the consumption over 1litre for each 100km. so I was averaging between 5 and 6. usually 5.5 or so. even during trackdays it proved to be very efficient, it newer went over 9litres/100km