A while back, I had noticed my mpg had taken a dive on 2001 SR5. I could've sworn I at some point or another (past 8 months) was getting about 18 mpg; I'm lucky to get 15 mpg now. One thing I had noticed was that a hose which vented gases from the gas tank and connected to the intake manifold, had popped off. Since reattaching it, I still seem to be getting less mpg than what I was getting before. Does the computer need some sort of reboot? What do I need to unplug? Any thoughts?