Performance Specs
Oh, I forgot to mention how this think performs on the road.
I have a 6.9 Liter motor with a 5 speed manual transmission.
I don't trust the speedometer in this thing, so all of my speed numbers are based on GPS data.
On the Interstate flat and level the top speed is 63.1 MPH @ 2900RPM. It won't do more than 3100 RPM and about 66.2 MPH on a steep Interstate grade (5%). Both of those numbers are pedal-to-the-floor. If I put it in Neutral and coast downhill on a short stretch I can get about 67.3 MPH (the motor is at idle at that point). On one really long downhill stretch in PA I got it to 75.1 MPH. Yes I am insane, no I don't recommend you try it. I just had to know what it would do. I was still being passed by almost everybody else.
Downhill off of the interstate with steeper grades, it would get scary so I usually coasted in 4th at about 45 MPH or 5th gear at less than 60 MPH.
Uphill on the Interstate (5% grade) I can't leave it in 5th gear, it just doesn't have the juice. In 4th gear it will do about 43.5 MPH with the pedal to the floor. On non-interstate roads with steeper uphill grades I was sometimes getting 27 MPH or less in 3rd gear and straining to do it.
All-in-all performance was better than I expected on flat and level ground and worse than I expected uphill. It wasn't a bad cruiser, just a little bit loud.
It burned about 1 quart of oil every 200 miles like clockwork. I just kept a gallon of Rotella-T onhand at all times and everything was great. Gas (Diesel) mileage was pretty good for as big and heavy as it is. About 8-10 MPG depending on how much of a lead-foot I was being. It never ran hot, it always had good oil pressure and it started and ran like a champ. I'm pretty happy with it.