[Jackpine]

Glad you're having fun Lars! Seeing 12.8 volts at idle says, "Raise the idle speed" to me too. I'd try as little as possible though, maybe 50 RPMs and see what happens?

That's a big speed error though. If I understood you correctly, the truck said it was going 8 mph faster than you were really going at interstate speeds? That's a 10% error! And, that doesn't seem right for a custom, unmodified tune. I wonder if your gears are correct? I'd check both GR and TS and plug in the values you used to use with your canned tunes.

You might want to play a bit with the TC lock/unlock in the 3-4 shift range. It sounds like the TC is too sensitive, which is what I felt. I simply reduced both the lock and unlock points and I like the result a lot better. Tins is clearly something Bill could also adjust, but it almost has to be done by trial and error and "feel" on the actual truck doesn't it? Possibly, once you get the part throttle shifts and TC behavior to your liking, you could tell Bill your "custom settings" and he could adjust your tune. If I ever feel Bill has time for this sort of "fine tuning", I'll let him know how I've set mine up. Right now, he has more important things to do.

I agree, no point in messing with the shift firmness at all. I think it's perfect in my truck.

I doubt the CHT difference is a big deal. Possibly caused by a different A/F ratio? And, that's clearly in the range it needs to be for efficient operation.

- Jack