Compression Ignition Addict
Join Date: Sep 2012
Location: The 'Sip
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I think most of the shifting complaints are about the Spartan.
The MPG gains vary vehicle to vehicle, but unloaded they generally pick up about 2-5 MPG hwy unloaded at 65-70 MPH. In the city, you can expect about a 1-3 MPG boost (depending on traffic, number of stops, duration of trips, temps, etc.). Yes, I know the factors that affect MPG all too well. You didn't say you wanted every specific thing about them so I replied generally.
Towing is not recommended with the power turned up. For that, you can just set something like the Mini Maxx on "No Power" setting (which actually varies from 0-50 HP depending on tune level). This should keep the temps down. You should still see an MPG bump, but that's really dependent on trailer weight, speed, number of stops, and trailer aero.
As an example, my truck now reports back about 22-23 MPG on 65-70 MPH unloaded trips (well, loaded toolbox) but hand-calculated it's about 18.0-19.5 MPG.
The 6.4L Power Stroke responds better than just about any truck I know of to a simple tuner, exhaust, and air intake system. They regularly dyno in the low to mid 500 WHP level with the Mini or Spartan on the big tunes. Torque usually ranges from 800-1100 lb-ft. These numbers have been verified many times over by the different forums and dynos across the country.
It may be your only purpose in life is to serve as a warning for others.