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 slower the motor the higher the MPG. You can tell when you need to kick it out of OD. I have a class C diesel and never take mine out of OD except when I am in the mountains or descending a long hill. Camp on.