I have kept a mileage record since I got it so I transfered that to my gas log. Things have settled down. I've gone 750+ miles with no problems (fuel filter must have been culprit). Not sure if I can get to the trans swap soon, I have a bathroom I'm remodeling and my wife says its priority.
we'll see... I'm expecting it to help alot. I'll take a guess and say it'll add 3-4mpg. It's a random guess... more would be better.