2011-2012 F550 - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 07-09-2012, 06:18 PM Thread Starter
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2011-2012 F550

I am looking at a new f550 4x4 6.7 with 4.88 rears. Anyone own one? Wondering what kind of rpm they spin out @70 MPH, and what fuel mileage they get.
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post #2 of 2 Old 07-09-2012, 09:22 PM
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Holy, I can't imagine what 4.88's turn. our f450 has 430's and although we love it for towing, don't expect much more than 10 mpg if your lucky with 430's. With a 4.88 you are gonna definitely be in the single digits mpg wise. Haha. We kinda wish we would have done 4.10 gear. The 6 speed tranny helps out alot too. First gear is soooo low. It will get anything moving.

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