Damn! I just wrote a reply to you that was worthy of a Pulitzer, and then accidentally deleted it. Sometimes, I hate myself. Oh well, here goes again:
There's no secret to the settings - I've posted them before (but it might be hard to find). For the part throttle upshift/downshift settings, I use -2, -3 and -5 for the 1-2, 2-1; 2-3, 3-2; and 3-4, 4-3 shift points. These are maximum reductions. I do the same thing for torque converter lock/unlock settings: -2, -3, -5 and -10 for 1st, 2nd, 3rd, and 4th gears. The goal is to get the TC locked as soon as possible and keep it locked as long as possible.
Both shifting and TC behavior are dependent on speed and throttle position. At a more "open" throttle, the speeds where things change move higher. In general, operating at the highest possible gear with the TC locked gives the best mileage provided the "load" is not too high. So, these settings may not be best for everyone. It's best to experiment, which is a little hard since you really need to try different settings under identical speed, wind, temperature and road slope conditions. I've found the Inst MPG readout in the Gryphon to be helpful. Sometimes, 3rd gear with the TC locked is better than 4th with the TC unlocked.
I've also found that a long-term record of mileage is helpful and I adapted a downloadable spreadsheet to help with this. It shows me my average fuel economy while towing and not towing as well as keeping a record of my towing and non-towing miles driven. In the graph, the blue line is MPG at each fillup and the green line is cost per mile. This spreadsheet ends in October, because I forgot to enter a fillup and had to start over.
Now, I'm going to post this before I lose it again!
- Jack