This is built and used for my 1,800 mile trip from New Meadows, ID to Mohave Valley, AZ I averaged 12.6 MPG on good weather and towing a 31 foot Jayco Eagle GCW was 17,300 pounds. This tune is strong enough to pull the heaviest loads even on level 3. EGT's are good and very controlled for my towing. This is built around an average road speed of 55 to 65 MPH. I really never needed any wire tap with the amount of power just level 3 has.
WARNING: I would highly recommend head studs the timing in this tune is about 23* at 2k RPM's.