How to keep cost down on my gas heating bill?
Yes, lowering the thermostat will save you money. Looking for places where cold air is getting into your house, or warm air is getting out, will also save you money. One common place where people lose warm air in their house is the pull down stairs to the attic. This is very seldom sealed properly.
Well dropping a few degrees will make a difference in the bill but not a big difference. When you add that to insulating and stopping drafts though you can make a big difference. Here are a couple of ideas for stopping drafts. If you have a fireplace or gas log stop using it and plug the flue with a chimney balloon. Where you pipes enter the home use expandable foam to seal around them. If you have small basement windows cover them with plastic film. If your basement base boards are not insulated already then insulate them. Use the bathroom vent fan and stove vent fan sparingly.