vios normally can get .15sen/km easily.
my normal consumption is rm50 around 350KM ( mix drive speed/relax) or 380-400km ( relax )
and the car has done 200,000Km on it. salute to the 1nzfe engine.

for your new cars its normal to have a bit higher FC , due to the engine part getting run-in should be improving by 20,000km.
btw if you have the money go for fully like MObil 1 etc. if not normal Toyota oil semi sync would do. provided change every 7000km would do.my car done 200,000km so far no problem and FC is still the same . NCP42 though.

what kind of bars??. if the weight is quite heavy will effect your FC. more weight = more fuel

there you go , better handling = higher speed = more FC.

are you sure your fully synthetic is original ???
i havent had that kind of experience before , but im using mobil 1.
toyota oil might just be different.
my fren is using the lexus fully synt oil.RM110(lowyat auto garage) dunno ori or fake)
will get his feedback whether ok or not.

well i remember there were some raids a few years back on pirated engine oil.
im sure the syndicate is very much still in business today.
and i dont think original quality is at par with cheap pirated products.
usable yes but would it perform the same well no.