Originally Posted by jnm
Eco pro seems to prevent you from doing things that would really damage your economy (for example by dulling throttle response). So if you are already driving in a very economical manner (for example at constant 65 mph on the cruise control) then enabling Eco pro will probably not save you any extra gas.
I believe ECO PRO does more than just adjust throttle response; it also uses less energy while the AC is on.
My A/C was on the way home as well and was doing 80 MPH.