I've got the Cat C-12, 10 speed three pedal autoshift trans. Looks like my gearing is pretty close to yours? You're mpg is slightly better than mine. I've heard those Mercedes engines are good mpg's. Mines rated 430 h/p 1650 tq.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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