tach reading

Have a 2003 150 5.4 at 60mph what should the tach read. On a long trip the other day it seemed like it was holding back.
Thanks
Ed

My 91 hold at 2000 just for reference

My 2003 Supercrew has the 5.4, auto. Tach at about 70 mph is between 1900-2000 rpms. It still drinks the gas at what feels like a low rpm.