cumminsx 15 450 hp with eaton 10 speed overdrive and 3.36 rears

hey guys i am looking at a 2016 579 with cummins isx 15 450 hp with 10 speed eaton smart advantage overdrive with 3.36 rears. i know its a bad combination if i want to run close to 70 but will it give good mpg at 62-65?

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