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I don't know what the real world figures are, but EPA estimates put the two engines within 1 to 2 mpg of each other, which to me would give a pretty clear advantage to the 3.4 V-6 since it makes so much more power.

We own both. I would strongly prefer the 3.4; it gets approximately the same mileage and is much more powerful. Also, timing belt vs. chain (though the chain has a long service interval), very good motor, easy to work on.

-Bill
'87 4Runner w/ '96 5VZ-FE, 'Red Chili II'
'97 Taco XtraCab 3RZ-FE, 'BlackBean'
TLCA # 13257, Rising Sun 4x4 Club Land Use Coordinator
"He who stops being better stops being good." -Oliver Cromwell