Single Rear Wheel vs Dually - Whats the Best for You

Assuming both the single and the dual axeled rig have the same GAWR, assume 10,000 lbs, same overall width of 8',the single axel will weigh upwards of 200 lbs less than the dual rig. a semi with a 20K axle will be 300-400 lbs less with super singles. As such, singles will have more payload potential than a dually. Being as they weigh less, less HP/torque is needed to get the tires moving, along with staying moving at a given speed, so better MPG should be expected and achieved. Assuming these specs, the single tired rig is the better option.....

Now if you want to compare the 2500 I have with a 6000 gvw RA, to my 05 dually with an 8500 lbs capacity, or the 16500 RA in my International dump truck.....Pretty easy to tell which rig will win the most potential payload, best ability to tow a larger trailer etc.

So, at the end of the day, how would you like to compare the two?!?!? 1st paragraph? or 2nd paragraph?

Marty