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People that I've talked to that have the DuraMax all say they have the 3.73 rear end. Needless to say, that should get better mileage than those who have the 4.10 rear end. I don't know anyone who has an "F" series truck with a 4.10 rear end that gets better than 11-12 mpg towing. I get 9-11, depending on wind conditions.
Orv
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