You don't just believe whatever you hear when it comes to machines and science, you test and experiment. 4A-GE BT are infamous for being thirsty in this part of the world, because of the half-a55ed swaps being done here. If it was wired up correct with all the sensors working fine, and the engine running on optimum temp, it would return the same fuel average of what an average 1.6 liter engine returns.
On the S engines, there are many variations of this engine with different fuel consumption charts, cannot comment on one only.