Most of my driving is between 55 and 75mph. Power feels pretty good for highway cruising and maintaining speed on grades right now between 60-65. I’d prefer to cruise a little lower rpm at 75 without sacrificing too much of that power so I think a 20% gear drop is too much. I think 3.46 will be a good compromise. 75 is about the fastest I drive, rpm will drop from 3720 to 3488 with the 3.46s.