Well, that explains a lot.
As a matter of fact I just rechecked the highest point in Texas, and one Internet source gives it in feet and one says its exactly the same in meters. Apparently it's actually over 8000 feet--but it's a long way from Sonora.
Same in feet as in meters.....I think you should check your source tomorrow and see if the numbers change!
Anyway...Im gonna shoot some pigs in Florida come February ...in two different places...but I think there I can personally measure the elevation with my dial calipers
If it aint under water, it'll be above see level.
Gotta say though, if figures are correct I was surprised with Van Horn.