How many people use ECO mode? If so do you use it highway, local driving or both? I've just done back to back tanks with the same driving for each, 40 mile round trip 50% local highway, and got 1mpg worse in ECO mode. The driveability seems worse in ECO mode as well. I particularly don't like the delay in starting the ICE when pulling away from lights. It makes for an unsmooth start. Just looking for other opinions.