On a concrete test track, you are correct. In the real world, you are full of it. The tracks advatage comes in two areas. They do not compress nearly as much soft soil, which reduces their rolling resistance dramatically compared to tires which are compressing twice as much area. They also are extremely efficient at transfering power from the track to the soil. Tracks will loose 1-2% to slippage. Tires will lose about 10% at their best efficiency in soil. You can get the slippage lower, but the cost in moving added weight and making deeper ruts exceeds the gain. | 
Drawbar horsepower tracks vs. wheels
