I would think it depends on the city. Portland Oregon is about 3 hours (at highway speeds) from Seattle, 7 hours from Boise, and about 9 hours from Sacramento (

I would think it depends on the city. Portland Oregon is about 3 hours (at highway speeds) from Seattle, 7 hours from Boise, and about 9 hours from Sacramento (the next cities to the North, West and South). There is no demand spillover for cities that are as isolated as Portland.