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Grand Prix:

2.8 Liter V6, Auto Transmission: 18 - 27 MPG 2.8 Liter V6, Manual Transmission: 16 - 27 MPG 3.1 Liter V6, Auto Transmission: 17 - 28 MPG I have the same year car with a 3.1 liter V6, I get about 29 - 30 mpg driving mostly on the freeway with cruise control.

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