My Class C has a E4OD transmission and I live in FL where it's flat, so my question is, should I drive all the time with overdrive turned on? It does seem to shift better when I do.
The vehicle is geared to work with that transmission so let it do it's thing. Going up a hill it will downshift when appropriate but there's no issue with being proactive and downshifting to keep the rpm's up or when the transmission is hunting between gears too much.