what ATF do you like?
 

What tranny fluid is best for higher milage cars. Is there really a difference anyway?

I would suggest two options; A quality brand name (like valvoline) dexron ATF product of the type specific to your car. The alternative would be switching to a well regarded synthetic ATF such as Mobil1 or Amsoil.

I am sure you will find folks with opinions either direction, however, the real key is regularly scheduled fluid and filter replacement.

Ditto. Lots of opinions. It is most important to change it regularly (every 30K).

Mobil 1 synthetic, although I don't know what kind of milage increase you could expect.

Peter