1.- what is faster a stock car whit a manual trany or the auto. whit final drive mod.

manual tranny

2.- how fast are you getting from 0 - 60 whit the auto trany, and whit what mods, becouse i'm getting in 10.5 seconds

10.5?? how are you timing this..

3.- i get 20 mpg whit my auto trany and a heavy foot, how bad is that??

bad, I get 35mpg
might want to look into replacing the front o2 sensor.
and spell "with" right

1998 dodge avenger 4 cyl AT
Mods are:
Not enough