exactly, 4age only VVT ma.. 1NZ got VVT-i ma..
the 'i' ery important and intelligent!.
quite teruk, what is the total mileage clocked ?
either u maintain 4AFE, go do a engine flush, engine de-carbonized, change petrol filter,
clean fuel line, clean throttle body,chg all or most of the oil seals, flush ur gearbox,
reset ur ecu, check your exhaust/muffler, check your O2 sensor, air-flow sensor...
i believe it will improve your FC and pro-long the engine/transmission life.
previously, when i was on 4AFE, i can get like 11~12km per liter fuel consumption.
currently, even on my 20v, sometimes i also nearly can get that goof FC.
it all depend on how u maintain your car's health, and your driving style.
P.S.: i had a fren with vios which having bad FC, ended up car sent back to toyota SC,
re-tune the ecu, then only get back the fc as claimed. :hmmmm: