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...FWIW our 1999 Malibu 3.1L V6 with 4-speed automatic transmission was "old-EPA" rated at 20/29 mpg, but we consistently got 29-32 mpg on the highway and about 25-27 mpg around town.
...unfortunately, I don't know how well the 3.1L and 3.4L engines "scale" to each other.
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