Wider wheels and tires will cause your MPG to drop slightly, but not enough to go to 200-220 a tank. When I got wider wheels and tires I went from 345~ to 300~ per tank.
Either you, or have a mechanic do it, remove the throttle body and clean the IACV. I did that to mine and started getting better mileage. Fuel system cleaners help, but that stuff is gunked on there. I had to use carb cleaner and a toothbrush to get that stuff off of there.
Might not completely fix your issue, but I can guarantee it will help.
