For the average North American, Japanese or Australian motorist who commutes in a passenger vehicle driven in the city or suburban areas?
None.
Manual transmissions are arguably more reliable because they are inherently simpler devices, but the average Australian motorist probably wouldn't keep their vehicle to the point where that might prove advantageous (i.e. distances in excess of 200 000 km).
The loss of fuel efficiency is outweighed by convenience, because the price of fuel isn't something ridiculous like $2.30 per litre, which is what the average European motorist is faced with.
The loss of drivetrain efficiency is outweighed by engines with (on average) larger displacements, as registration, tax and running costs of such vehicles are not significantly penalised in Australia.
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