If I do go with overdrive, it will probably be with an Overdrive/Underdrive unit, so I can multiply my gears on the road. I'm just not sure how stout these units are when towing a car trailer. 12-15 mpg would be acceptable mileage for me, since the truck more resembles an anvil than a jetliner! (I AM a little dismayed by the cost of diesel fuel nowadays...used to be cheaper than gas, but then I guess you have to pay for that "box-of-bolts" sound!
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