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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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