MPG experiment....1976 Dart Lite

19.17 on the last tank.
I was disappointed.
We poked around under hood, and the PCV hose was plugged on carb, I guess I forgot to hook it back up. The blow by went to nothing! wahoo.
I also had some cracked vacuum plugs, so we fixed that, and while messing with this we noiced the entire carb was loose! I need to grab some lock washers for that. We adjusted the idle down, and air fuel mixtrure screw, the thing idles glass smooth.
I also noticed the oil was way low.
I jetted the carb up, it appears a small jet on this carb has the car into the powervalve a lot. I went from 62 to 64, I will run it with the 64 for this tank to see how it goes.