Hey @Cruiser Jimmy thanks for the update. Yeah it seems that is pretty standard for the trucks one they are weighted down and have some miles on them. Since I just figured out that my ECM wasn't plugged in and that could possibly be a culprit I am going to restart my calcs. I literally have had everything from a tank that runs me about 125miles to a tank that runs me my old average of 180+ miles. All of that within the same driving specs (mainly 90% city, 10%highway. I have pretty much come to terms with the fact that I will never really avg. any better than 10-12mpg, when I start seeing 5-8mpg I start wondering what is going on.