I have been running with the front CV's out for over a year now, and I would say that the increase in gas mileage is very small and not worth the time especially if your CV's are funtioning perfectly well right now. I have been getting a little more noise from the front Diff though as it is just spinning from the drve shaft. If anything I think I would rather take out the front driveshaft as opposed to removing both CV's I just did it because both my CV grenaded.