Don't really know,I have to be in 4th gear to go over 55 @2300rpm....4th gear for me is worthless where I have travelled so far.
it is so "hilly" here that trans starts to get warm going uphill under 2200rpm.
Next year iwe have a trip planned that will put us on flat ground
for a good part of trip.
When I have put it into 4th on level ground it will "idle" at about 60mph.....then I have to slow down to be in 3rd for next grade.