To save on electricity costs based on fridge usage, measure its weekly energy consumption with a power meter to calculate the daily average in kilowatt-hours (kWh). For example, if your fridge uses 1 kWh daily, it contributes roughly $3 to your $40 monthly bill (assuming $0.10 per kWh). To reduce next month's bill, set the fridge to 37-40°F and the freezer to 0-5°F, clean the coils, ensure tight door seals, organize contents to minimize door opening time, and consider upgrading to an Energy Star-rated model. These steps can help you save around 10%, potentially reducing your bill by $4 next month.