The path of totality is only 70 miles wide. Being a bit of a geek, I made Oregon plans months ago, rub rub. They are expecting millions in Oregon and every mountain peak will be overcrowded. They're really worried about trash and resource damage.
The amount of sun eclipsed is strictly a function of your lat and long. A mountain peak adds nice ambiance, but it doesn't change the physics.
Interactive Google Map Eclipse Simulator - enter your location Eclipse2017.org Nasa Eclipse Website 
