On mine truck the cruise is good @ 68-72mph @2300 rpm. This is with 31” tall tires and 3.73 gears. It goes down the highway nicely but falls short in several areas: 1) starting from a stop on a hill or loaded. 1st gear is not low enough 2) reverse is useless because it is not even close to low enough. Worse than 1st gear even & i use low range in reverse frequently 3) useable torque in overdrive. It cruises nice but requires a downshift into 4th to overcome hills. It handles freeway overpasses well but not long grades. An upgraded tune will also help with this as I am only running a Malone stage 1 tune. One other thing to keep in mind when going from a v6 to an inline 4, is that the 4 will idle about 900 rpm instead of the 6’s 650. In my experience it is a significant change that needs compensated for in terms of gearing. In short, my opinion is that gearing is key.