G3 rpm/gear ratio

.69 overdrive.

I have figured the rpm thing, what I don’t know is where the engine is happiest.

1800 at cruise on the highway sounds great until you find out it is a dog there.

The 6.1 is no dead dog!!!! The torque curve is very flat - especially at lower rpm.. eg
300 ft-lbs @1200 rpm
325 ft-lbs @1600 rpm
340 ft-lbs @2000 rpm
350 ft-lbs @2400 rpm