Engine compression test help

[wjburken]

Did compression test today, checked 3 cylinders on driver side. Was approximately 170 in each cylinder, so I’m happy with results.
Then decided to change transfer case fluid.
Almost 1.25 dark fluid leaked out and I filled with almost 2 quarts. I see a bit improvement on MPG.
Will transfer case fluid change can improve MPG ?

It can. Anytime you can reduce friction in your drive train, you can get an uptick in MPG.

 

[OR VietVet]

What Wade said. All those moving parts in your systems need fresh fluid to work easier and all contributes to less drag.