[DonPaulB]

I have been driving my new cube with the overdrive on all the time. Is this correct? My mileage (I'm a hypermiler) is 34.5 mpg. I'm sure it would be lower without the OD. Am I hurting my engine?

 

[fotomoto]

No, you are driving it correctly. Turn it off for mountain driving or any other situation where you'd need the extra gearing. It will kill your mileage.