A couple things:  Call your gas company and tell them you think your meter is leaking.  They will come check it for free and tell you if your losing gas.  Open blinds to expose south-facing windows during the day in the winter and close them in the summer.  This lets the sun heat a room or keeps it from heating a room in the summer.  Be careful about when doors and windows are open. Think about whether its helping or hurting what your heating/cooling system is doing at the time.

chnage you faucets to spray out less water, change your lightbulbs, unplug chargers when not in use, unplug things that are not being used especailly if they have a digital clock you dont need, turn down your thermostat at night and as always recycle