My dad pulled his enclosed trailer and 57 ford retractable to Florida with his 3.0 duramax. They said it worked a lot better than the 5.3 in his old truck. I dont remember his mileage but it was better also. Wasnt screaming up mountains. I got a Tahoe with the diesel and can get 33 mpg on the highway and mid 20s local. The 5.3 in the last one would get 18 and that was about it.
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Bill
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