today i test drove an 89 420 sel and teh transmission seemed to not go into the last gear. The rpms gage was at 3000 and the car was going 80mph. I thought it should down shift but wasnt sure. It just didnt feel right. The owner told me that there is a button under the gas pedal and i tried to push it while driving 80 but did not do anything as far as shifting down to a lower gear. Is this normal or am i just feeling to much for a car traveling at 80mph.

What should the rpms be at 80-85mph?

Bedros