==20 miles from downtown== 
 Cielo Vista Mall is in Exit 24 or 25, IIRC on the I-10. Sunland Park is on Exit 11, and that is on the West side of the city. So it is impossible for Sunland Park to be "20 miles from downtown El Paso". It is more like 10 miles or less. 

 Mexican Border is about 5 miles if you count distance from the Cordova de las Americas international bridge (exit 23 on I-10, and definitely less than a mile from there to the actual bridge), but it may be even less to the actual border. Though in practice, 5 miles would be pretty accurate.