It's the typical problem with a gasser. No torque at low rpm's, but, very little is needed to maintain cruise on level ground. So, 1800 rpm's is fine.

But, need to climb a grade, even a small one? Sorry, no torque available for that. So, the drivetrain must downshift to get you the necessary torque to the pavement.

Every time it shifts, it exacts some bit of wear from the clutches in the transmission. Will the trans make it to 100K? Probably. But, some don't.

Natuarally, if you had a diesel and it was turning 3000 rpm at the same speed, you have all the power you need.......right on tap.