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Unfortunately, that firmware update has a reputation for negatively impacting fuel economy and only reducing oil consumption in the short term, if at all. The better/safer option, firmware update or not, is to use 0W30/5W30 synthetic instead of the factory 0W20/5W20 synthetic. The 30 weight oil usually corrects the oil consumption problem, quiets the engine, and does a much better job of lubricating everything. Toyota specifies 20 weight oil in the U.S. for the new 1.8L engine in order to slightly boost their CAFE numbers. But the downside is less effective engine protection because of the lower viscosity, as evidenced by oil consumption (almost certainly accompanied by premature engine wear).
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