Thank you for the responses, and i've been making small incremental changes every night and then testing them on the way to work. I'm well over 60 chip burns so far, its a good thing i can re-use these things. I'm not running premium fuel right now, I have increased my spark with higher voltage coil and good wires while adjusting my timing tables to allow for no knock. I am definitely learning my way around how to re-tune these engines for premium fuel use.
I have the video of that white single cab chevy in my mind Ron, don't worry i'm heading for the 30's if we can get it there. For me though the success comes when my wife can drive the truck and get good mileage as well as when I drive.
The TBI computer still has the ability to learn, it reminds me every time I set something too far in my parameters of a new tune and she tries to re-learn what in the heck has happened.
If I can find the level for minimum fuel with the groove I can start making other improvements and see how much more they improve the overall fuel use as well. Still need to be able to get around someone in traffic though, so I still have to tune for 10 seconds of WOT. Driving home at 5pm is no fun most of the time.
Ken