Mileage single vs. dually depends somewhat on tires.
Learned that lesson on bicycles. Knobby dirt bike tires are harder to pedal because the have more traction than say a standard or a racing bike tire. Big mud grippers on a single-rear will eat up more horsepower than a standard all-weather pickup tire, and more than duallies that have to be narrower to even fit on the truck.
If what it has are fairly standard 17" tires, the single rear will get maybe a little better mileage than the dually by virtue of having less rubber on the road (two narrower dually tires are still wider than a single), a couple hundred pounds less weight and not having the wind drag of the dually fenders. Duallys are more likely to have the lower-geared rear-end, too, than a single, and if they do, that would make more difference than all the other three factors put together.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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