Elevation change

I may be moving back to Nebraska, which is roughly 4500 ft above sea level. My car has been tuned at sea level. I drive a 2008 gt500. I already have a fuel specific tune set up for when 93 octane isn't available due to location. Is there anything I should be aware of? I've asked my tuner, and didn't get a reply. Tyia

if its tuned properly it wont make any difference

if u want to be safe pull 3 degrees of timing at wot.