Guys, since I couldn't be at the meeting tonight I wasted 30 minutes getting caught up on this thread. Permit me to paraphrase: lots more banter, more skepticism. Turns out he was using no correction for 35" tires and 4.88 gears, which as I definitely know yields higher than actual MPG. Also he was concerned that his O2 sensors were shot, but later learned he didn't know how to use his fancy scope thingy.
So now the truck is tuned, the O2 sensors verified, the consensus is "actual" MPG before was more like 15.. and supposedly he'll be posting up some good "after" numbers tonight. that said, you may now advance to page 5: http://forum.ih8mud.com/80-series-te...ncrease-5.html