Thread: New GMC Sierra
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Old 12-12-2014, 04:31 PM   #14
TAKPAK
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Join Date: Feb 2008
Location: Hillsboro
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M.O.C. #8238
Quote:
quote:Originally posted by rohrmann

You will come to love the DEF system when you realize that is what enabled them to lean out the fuel mixture so you will probably see around 22 MPG on the highway when not pulling the Monty. It's really not that much of a hassle once you get used to it.
Hmmm, last year when we went to California (mostly empty, no trailer) it was averaging 22-23 MPG most of the time. The 2008 was always good on mileage. Hope the new one is too.
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