Well, the first thing that jumps out at me is that you seem to think that adjusting your TV cable will somehow change your final drive ratio. You only change your shift points by adjusting that, not your cruising RPM. The gears determine that.
Or maybe I misunderstood your question there...
Actually, no. The first thing that jumped out at me was the complete lack of periods, commas, capitalization, or other helpful punctuation in your post. Made it a bit hard do read.
If you could improve on that, that would be great, for the future. You'll make it easier for us to help you...
Looks like you have a decent start on doing a tuneup on your car, which is a good start to upping your mileage. I'd suggest a couple of things that you didn't mention:
- Spark plugs, if they're old, or if they're Bosch Platinums.
- Oxygen sensor, if it'* really old, or if it'* a Bosch.
- Maybe spark plug wires, if they are original, or extremely cheap replacenemts.
- Maybe clean the TB.
Also make sure that your torque converter is locking up when it should be. Your slight exhaust leak will come in handy here, since you can hear the engine RPMs (unless you have a tach, which it sounds like you might).
Just how bad is your mileage, anyway? What kind of driving?