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Peterbilt 389 MPG

37 Peterbilt 389s have provided 2.3 million miles of real world fuel economy & MPG data.
Click here to view all the Peterbilt 389s currently participating in our fuel tracking program.

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Manual Transmissions - Shift at lower RPMs

For those of you who drive stick, upshifting at lower revs w... ...

by realgeneric

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