How Much Horsepower Required to Cruise Comfortably at 70 MPH?

dibs i am so lost
your worried a more powerful engine wont cruise as comfortable as the grocery getter engine you got now?

what exactly do you mean with "cruising"?
being able to stomp on it and go sideways?
or comfortable not overstressing the engine?

i gues it dont matter anyway, because the 340 wont cruise at the same RPM at the same speed as the 318