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They build it to get good number on the EPA test cycle and the EPA test cycle doesn't go that fast. They want the sweet spot to be at the test speed. There is probably also a point where the gears would be too much of a drop in RPM or just too much strain on the parts themselves. There is also a limit in the size of a transmission between the input and output shafts that the difference in what the lowest gear to the highest gear can be. To make that separation bigger they would have to increase the separation of the shafts. So it's probably a combination of all 3. I bet bottom line, if they could make the EPA number better they would do it even if they had to re-design everything else to work with it.
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