30.27 miles (48.71 kilometres)
It is 216 miles according to Google Maps.
120 miles down I-20 WEST.
425 miles taking this route: Take U.S. 290 WEST from Austin to I-10 WEST. Take I-10 WEST to SH-17 to FT. DAVIS at EXIT 209. Follow SH-17 SOUTH to Ft. Davis.
It is 326 miles according to Google Maps.