I don't think I am missing anything. The truck doesn't run just "OK", it runs great! My point is running the numbers the way described in this thread told me that I have 7 bad injectors and 1 good one. That is exactly backwards to reality. The one it says is good is the bad one(well not bad bad but worse than the others). and the other 7 are fine. They are not new so I know they are not perfect.
I'm not going to argue about this one anymore. I said what I had to say. People can take it as is or ignore it. It doesn't really matter to me. I just hate to see people spending a ton of money to replace a part that may not be bad. A return test is the only way to test for sure.
But you also think a sooty piston top is worse than a clean piston top...... Would you think a white spark plug is better than a nice golden brown?