I bought my Tacoma used nine years ago, and I have done all of the required maintenance.
The only thing that has ever required replacing due to failure was the mass air flow sensor.
It went out about a year after I bought the Tacoma.
The engine still worked with the blown mass air flow sensor; it just would not accelerate smoothly.
These 3.4 Liter V6 engines are great motors as far as power and reliability, but they do not get good gas mileage.
Mine gets anywhere between 17-19 miles per gallon depending on where and how I am driving it.
Anybody who says they are getting above 20 miles per gallon is driving down hill with their ignition off or dropping it out of an airplane.
the full review
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