Im am trying to tune my 93 K1500, 16168625, $E6 using Daves spread sheet. I have a good idea what to do as far as staying out of PE, etc. My question is regarding the history average in tunerpro. To get a true history average how does tunerpro do this? I believe as long as all my log files have been played through TP at some point, the average will come from all the played log files.. Please correct me if Im wrong. Just trying to make sure my history average is from all my log files. Thanks