Note that several famous college towns (Boulder, Davis, Fort Collins) fill the highest spots. Portland reaches platinum status whereas Seattle is gold. Other notable college towns fill out many of the gold spots (Eugene, Minneapolis, Madison, Missoula). Salt Lake City is rated silver. If you're looking for a new place to live, the quality of life in each of these towns is quite high. Note the oddity that is Scottsdale (and Tucson to some extent). I guess rich Arizonans are getting on board with great bike infrastructure. And good for them!
Might have to encourage the dear wife to accelerate our tour of the great American cities.