I feel your gas guzzling pain
I have an '06 Eddie Bauer and I have recently experienced the same exact issue. I had the tranny reprogramed in December with TSB 07-23-2 and since then my mileage has dropped down to about 240 miles per tank. For the first 17k miles we would not see less than 300 miles per tank. The tranny still just does not shift right, at times it feels like there is no power so you hit the gas a little harder and it about throws you in the back seat, I am sure this does not help mileage out. I skipped all the other tranny updates in hopes the latest one would take care of it, maybe thats my problem. I have heard a rumor that there is a new TSB out on the tranny, Can't wait to go back to the dealer for yet another one, but at $3 a gallon, I can't afford to drive it to much longer