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GMC Sierra 2500 HD MPG

655 GMC Sierra 2500 HDs have provided 11.4 million miles of real world fuel economy & MPG data.
Click here to view all the GMC Sierra 2500 HDs currently participating in our fuel tracking program.

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Cooler Fuel

I have found that filling up later in the evening or early i... ...

by silentECHO

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