I replaced my 1989 Toyota longbed pickup with a 2004 Tachoma.
I am somewhat disappointed as I expected more improvements after 15 years.
The following are the differences I have noted in the 2 trucks:
1. 2004 Tachoma does not come in a 7 foot bed. Not good for camping.
2. Tachoma uses 25 mpg. The 1989 used 27 mpg.
3. The engine doesn't seem as powerful as the 22R in the 1989.
4. The mirror adjusting mechanism feels loose but is useable. The 1989
mirrors could not be adjusted from inside the cab.
5. Engine light came on after 10,000 miles which was repaired under
warranty. On the 1989, it came on at 120,000 which I ate at considerable
cost.
6. Tachoma has no steering  problems. The 1989 PU made a loud noise when
turning hard left.

-Ira